Review on Feeding Square Aquarium Feeder Floating by Jeremy Camacho

I bought 3 of these and will be buying a few more soon. But I don't use them to feed fish. I grow duckweed in several of my aquariums and have had many problems with return water from HOB filters blowing duckweed all over the tank. I position them so that the return water from the HOB filters flows directly to these supply rings and the problem was solved. The surface remains pleasant and calm, and the duckweed is happy. If the water level drops between water changes, these feed rings also drop. I am very happy with them.