Pond Koi Fish Viewing Tube, Observation Tower for Aquatic Water Garden Koi Fish Ponds, Pex517

It is hard for me to describe how much joy this thing brings me! The fish LOVE IT, and use it every day. When the water in the tower is warmer than the pond temperature (almost all the time except early in the morning) they swim up in there and hang out all day. I can see them from inside the house and anywhere in the garden. It's time for me to put it away for the winter (due to freezing temperatures) but I've been putting it off because both me and the fish love it so much.It was easy to install once I made a flat spot for the stand. No roving animals have disturbed it.It DOES need to be cleaned pretty often since algae grows in there. The fish nibble at the algae but still it's not crystal clear like in the picture unless you take it down, scrub it out (requires a little time and effort) and put it back up. But even with algae in there it's still AWESOME.This thing seemed really expensive, like an indulgence, but it has been worth every penny!