---
product_id: 6541545
title: "One and Only Freshwater (DrTim's Aquatics One and Only Freshwater, 2oz)"
brand: "drtim's aquatics"
price: "€ 47.97"
currency: EUR
in_stock: true
reviews_count: 10
category: "Dr Tim's Aquatics"
url: https://www.desertcart.hr/products/6541545-one-and-only-freshwater-drtims-aquatics-one-and-only-freshwater
store_origin: HR
region: Croatia
---

# Fast nitrogen cycle boost 100% natural & eco-friendly Instant toxin neutralizer One and Only Freshwater (DrTim's Aquatics One and Only Freshwater, 2oz)

**Brand:** drtim's aquatics
**Price:** € 47.97
**Availability:** ✅ In Stock

## Summary

> ⚡ Transform your freshwater tank faster than ever — because your fish deserve the best!

## Quick Answers

- **What is this?** One and Only Freshwater (DrTim's Aquatics One and Only Freshwater, 2oz) by drtim's aquatics
- **How much does it cost?** € 47.97 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/6541545-one-and-only-freshwater-drtims-aquatics-one-and-only-freshwater)

## Best For

- drtim's aquatics enthusiasts

## Why This Product

- Trusted drtim's aquatics brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Versatile Treatment Sizes:** Available in multiple quantities to perfectly match your tank size from 30 to 1920 gallons.
- • **Eco-Friendly & Odorless Formula:** Maintain a pristine, natural environment without harsh chemicals or offensive smells.
- • **Trusted by Pros & Hobbyists Alike:** Backed by marine biology expertise and scientific research for reliable, proven results.
- • **Instantly Neutralizes Harmful Toxins:** Eliminate ammonia and nitrite quickly to protect your aquatic pets and promote crystal-clear water.
- • **Kickstart Your Aquarium’s Nitrogen Cycle:** Cycle your tank in days, not weeks, and introduce fish sooner with powerful nitrifying bacteria.

## Overview

DrTim's Aquatics One and Only Freshwater is a scientifically formulated nitrifying bacteria solution that accelerates the nitrogen cycle, instantly neutralizes toxic ammonia and nitrites, and creates a healthy biofilter in freshwater aquariums. This 100% natural, eco-friendly treatment eliminates new tank syndrome without harsh chemicals or odors, enabling fishkeepers to introduce aquatic life sooner and maintain crystal-clear, toxin-free water. Available in multiple sizes, it’s trusted by professionals and enthusiasts for fast, effective aquarium sanitation.

## Description

desertcart.com : DrTim's Aquatics One and Only Freshwater (DrTim's Aquatics One and Only Freshwater, 2oz) : Dr Tims One And Only : Pet Supplies

Review: A Lifesaver for New Aquariums - Dr. Tim’s Aquatics Freshwater One & Only Nitrifying Bacteria has been a game-changer for my new fish tank. This product has exceeded my expectations in various ways. Setting up a new aquarium can be challenging, especially when you’re trying to establish the right balance of beneficial bacteria. Dr. Tim’s Aquatics One & Only made this process a breeze. It quickly kick-started the nitrogen cycle, allowing me to introduce my fish sooner than I expected. Not only did it facilitate the establishment of a healthy biological filter, but it also acted as a disease treatment. It provides added protection for my fish by removing toxins and promoting water clarity. I particularly appreciate that this product is eco-friendly, which aligns with my commitment to responsible aquarium maintenance. In conclusion, Dr. Tim’s Aquatics Freshwater One & Only Nitrifying Bacteria is an exceptional product for anyone with a new fish tank. It’s efficient, eco-friendly, and a true lifesaver for both your fish and your peace of mind. I highly recommend it for any aquarium enthusiast.
Review: Awesome! - I cycled a 40 gallon breeder tank using Dr. Tims Nitrifying solution along with his ammonia product. The tank completely cycled in five days as verified with the API master test kit. This is a great product! The fish are thriving in their new home.

## Features

- THE BEST WAY TO SANITIZE A FRESHWATER AQUARIUM: Freshwater One & Only from Dr. Tim’s Aquatics quickly converts waste in aquariums and fish tanks to a non-toxic form. Utilize this powerful solution when setting up new fish tanks, while cleaning filters or adding new fish or after a water change.
- REMOVES HARMFUL TOXINS FROM FRESHWATER FISH TANKS: Even with regular water changes and maintenance, aquariums and fish tanks produces bad bacteria and it can take up to 30 days to eliminate waste. Not with Freshwater One & Only because this solution instantly creates a bio filter to remove nitrite and toxic ammonia naturally.
- 100% NATURAL, ECO-FRIENDLY FISH TANK CLEANER: There’s no need to wait when treating your new freshwater aquarium or fish tank with Freshwater One & Only. This fish tank cleaner eliminates new tank syndrome and does not include sulfur or other offensive odors.
- AQUARIUM SUPPLIES YOU NEED: Offer your pet fish and corals an environment in which they can thrive with this Freshwater One & Only for freshwater fish tanks and aquariums. Freshwater One & Only is available in quantities that include 30, 60, 120, 240, 480, 960 and 1920 gallons.
- HIGH-QUALITY AQUARIUM PRODUCTS: Dr. Tim’s Aquatics offers an expansive line of aquarium products used by professionals and residential customers. Based on years of experience in marine biology, Dr. Tim’s Aquatics’ products utilize his vast knowledge and are backed by scientific evidence and innovative research.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B001LULBXI |
| ASIN  | B001LULBXI |
| Best Sellers Rank | #27,111 in Pet Supplies ( See Top 100 in Pet Supplies ) #261 in Aquarium Water Treatments |
| Brand Name | DrTim's Aquatics |
| Color | Freshwater |
| Country of Origin | United States |
| Customer Reviews | 4.5 4.5 out of 5 stars (635) |
| Date First Available | November 21, 2008 |
| Date First Available  | November 21, 2008 |
| Directions | Adults 18 years and older. |
| Included Components | DrTim's Aquatics Ammonium Chloride |
| Is Discontinued By Manufacturer  | No |
| Item Dimensions LxWxH | 2 x 1 x 4.25 inches |
| Item Package Dimensions L x W x H | 3.74 x 1.5 x 1.42 inches |
| Item Weight | 2 Ounces |
| Item model number | 0 |
| Item model number  | 0 |
| Manufacturer | Dr Tim's Aquatics |
| Manufacturer  | Dr Tim's Aquatics |
| Model Name | 000 |
| Number of Items | 1 |
| Product Dimensions  | 2 x 1 x 4.25 inches; 2 ounces |
| Size | 2 oz - Treats 30 Gallons |
| Specific Uses for Product | Indoor |
| Style | One & Only |
| Target Audience Keyword | algae-eaters, betta-fish, bottom-feeder-fish, cichlid-fish, fish, goldfish, invertebrate-fish, mollusks, octopuses, rays, sharks, snails |

## Product Details

- **Brand:** DrTim's Aquatics
- **Item Form:** Liquid
- **Item Weight:** 2 Ounces
- **Liquid Volume:** 30 Gallons
- **Manufacturer:** Dr Tim's Aquatics

## Images

![One and Only Freshwater (DrTim's Aquatics One and Only Freshwater, 2oz) - Image 1](https://m.media-amazon.com/images/I/71un6XQNzUL.jpg)

## Questions & Answers

**Q: For a fluval spec 3, do i need to use the whole bottle or can i just use half?**
A: The bacteria will die most likely, use the whole bottle....and be careful how many fish you it in...you can use 30 bottles and if you have too many fish, your ammonia will not go away..you really should cycle the tank first....I learned the hard way unfortunately.....if you really want a to get rid of ammonia, buy an eheim canister filter, fill it with just "seachem matrix bio rocks".....no sponges....get that bacteria growing...you should be fine in 2-3 weeks....remember, that's all the fish need is bacteria, not sponges , and other useless crap...

**Q: Does it create ammonia?**
A: It does not create ammonia directly.  However, the dead algae cells decay and mineralized which can produce small amounts of ammonia.

**Q: I forgot to shake the bottle...do I need to start over? Also, it left white residue spread all over the gravel is that normal?**
A: You do not need to start over.  Maybe add some aquarium water to the bottle, shake and pour into the tank.
The white residue is normal.

**Q: Is it safe to use if I just used rapid fix ich repair on my tank ?**
A: Yes it is safe to use with the Kordon Rapid Cure

## Customer Reviews

### ⭐⭐⭐⭐⭐ A Lifesaver for New Aquariums
*by J***E on October 23, 2023*

Dr. Tim’s Aquatics Freshwater One & Only Nitrifying Bacteria has been a game-changer for my new fish tank. This product has exceeded my expectations in various ways. Setting up a new aquarium can be challenging, especially when you’re trying to establish the right balance of beneficial bacteria. Dr. Tim’s Aquatics One & Only made this process a breeze. It quickly kick-started the nitrogen cycle, allowing me to introduce my fish sooner than I expected. Not only did it facilitate the establishment of a healthy biological filter, but it also acted as a disease treatment. It provides added protection for my fish by removing toxins and promoting water clarity. I particularly appreciate that this product is eco-friendly, which aligns with my commitment to responsible aquarium maintenance. In conclusion, Dr. Tim’s Aquatics Freshwater One & Only Nitrifying Bacteria is an exceptional product for anyone with a new fish tank. It’s efficient, eco-friendly, and a true lifesaver for both your fish and your peace of mind. I highly recommend it for any aquarium enthusiast.

### ⭐⭐⭐⭐⭐ Awesome!
*by D***B on September 21, 2025*

I cycled a 40 gallon breeder tank using Dr. Tims Nitrifying solution along with his ammonia product. The tank completely cycled in five days as verified with the API master test kit. This is a great product! The fish are thriving in their new home.

### ⭐⭐⭐⭐⭐ Absolutely Works
*by S***E on November 1, 2012*

Started 3 29 gallon tanks for a research project in biology. Tank 1: Plain Water with ammonium chloride as ammonia source. Tank 2: APIs Quick Start with ammonium chloride as ammonia source. Tank 3: DrTim's One & Only with ammonium chloride as ammonia source. Ammonium Chloride was purchased from Amazon (DrTim's Ammonium Chloride Solution for Fish-less Cycling). Each tank was prepared with a standard dechlorinator (It is important not to use any product that binds or "locks" ammonia, as it is required for the cycle to progress). Water was allowed to rest for 24 hours, filters and heaters running, temps set to 80.5F, 30 LBS of standard gravel in each tank. Each tank received an initial dose of ammonium chloride of 29 drops (one drop per gallon), which raised ammonia to ~2.0 PPM. Caveats: If you use an API test kit, you will likely see about half the expected ammonia concentration. The test is not accurate at low levels, and does not measure the type of source used as well as other master kits. Be concise with the dosing and you are fine. You can use a Nutrifin NH3/NH4 test or other high grade ammonia detection kit that measures NH3 and NH4. Do not adjust water parameters or add water for several days. If you must adjust water parameters, do so slowly. Water should only be added if it has been allowed to rest after 24 hours once treated with dechlorinator. Results at 6 days: Tank 1: Barely detectable amount of ammonia reduction, zero nitrites, zero nitrates. Tank 2: Some reduction in ammonia, zero nitrites, ~20PPM nitrates. Tank 3: .50 PPM Ammonia, zero nitrites, 50 PPM nitrates Tank 3 has had one water change already, and is ready for the second due to rising nitrates. It is processing enough ammonia at this point to equal ~11 inches worth of fish. Ammonia has been added to this tank daily to sustain the cycle, as fish were never going to be introduced. I will be adding fish to this tank however, and reducing ammonium chloride dosing. Decided to keep this tank. Myth 1: There are many posts on the Internet about fish-less cycling. Many of which suggest the use of off-the-shelf ammonia that you find in your local grocery or hardware stores. While some of these sources might be safe, most are not. The ammonium chloride is cheap, and will cycle many, many tanks. Consumers are generally unaware of the fact that not all ingredients need to be listed on products not intended for human consumption. Therefore, they see water and ammonia listed on a label and assume there is no surfactant in the off-the-shelf product. This is simply not the case. Most of these products do in fact contain other ingredients that are not safe for fish, and will destroy the bacteria needed for the aquarium cycle. This can be seen in one of the other reviews. The result was, the tank did not cycle as anticipated. If you want good results and have gone to the expense of purchasing a bacterial additive, spend the extra couple of dollars and get a pure source of ammonia. Myth 2: Some postings on the Internet suggest that these products use terrestrial strains of bacteria. All nitrifying bacteria need soil or other surface. Therefore, all can be considered terrestrial. They are commonly found on the bottom of lakes and streams. Our filters and substrate mimic this environment. While evidence in my experiment suggests that not all products are created equal, some products do work -- and work exceptionally well. Myth 3: The cycle will crash because it isn't the right bacteria. Fact: If the bacteria were unable to sustain, we would not see the substantial growth noted in tank 3. In order for the ammonia to be processes and nitrite to nitrate, a large colony has to exist. Once these bacteria undergo binary fission (how they multiply), there is no logical argument that would support this cycle failing. If you have an environment where they will multiply, that will continue until there is no food source. Any crashing would be the result of that food source not being adequate for the colony. Another possible source of crashing, high nitrates (more than 50-75 PPM) as this will kill the bacteria. It is also possible that once the cycle begins to establish, that the consumer adds too many fish before the colony is large enough to sustain. If you opt for fish-less cycling, use a pure source of ammonia (ammonium chloride). If you opt for fish-in, make sure you do not use an ammonia binding product to dechlorinate the water. Let the water rest for a full 24 hours before you add fish and the product. You may test for ammonia/nitrite/nitrate -- but only adjust your parameters if the results show >2.0PPM Ammonia or >50PPM Nitrate. Other than that, leave it alone for at least a week. If you do need to reduce any of the parameters via a water change (25%), fill your bucket the day before and add your standard dechlorinator to the water and let it rest for a complete 24 hours before adding to the tank. Keep your filters wet at all times (bacteria will die). I consider this product a 5-star purchase. If you have any questions, please don't hesitate to ask.

## Frequently Bought Together

- DrTim’s Aquatics One & Only Live Nitrifying Solution – 2 oz – for Freshwater Fish Tanks – Supports Aquarium Cycling and Water Balance – Treats Up to 30 Gallons
- DrTim’s Aquatics Ammonium Chloride Solution – 4 oz – for Fishless Cycling in Freshwater & Saltwater Aquariums – Treats 200 Gallons
- API FRESHWATER MASTER TEST KIT 800-Test Freshwater Aquarium Water Master Test Kit, White, Single, Multi-colored

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*Product available on Desertcart Croatia*
*Store origin: HR*
*Last updated: 2026-03-20*