billburroughs
Aquarium Advice Apprentice
I just inherited the maintenance of the 65 gallon tank at my son's elementary school. It was in somewhat bad shape, mostly just a severe green algae problem. The issue is, I'm new to FW, I've been doing SW for a while. The biggest issue I have with this setup is I don't understand how the filter works. There is a builtin overflow box in the back corner and a powerhead toward the top of it pointing out a hole in the side of the overflow box. Under the powerhead is about 6 sponges of varying granularity. I guess I don't understand how the filter is working if the powerhead is sucking up water just above the sponges. The flow could just as easily come from the top of the tank and not get sucked in through the bottom where the sponges are. Any advice on how this setup should work?