My tank has 4 cichlids, 2 plecos, and an oscar. The turds build up, even though I have both under gravel filtration with a powerhead as well as a filter that hangs over the tank and takes replaceable charcoal/mesh filter media.
The problem I'm having is that the shit is sticking to the rocks, and unless i violently stir up the water, it wont come off the rocks easily. I have the traditional gravity assisted aquarium cleaner that sucks out the old water and poo, but it doesn't have enough suckage. I'd like to find something that is battery powered that has more suction, or water assisted so that while I'm pulling old dirty water out, its refilling with fresh clean water at the same time. Does such an animal exist? Took me a couple hours last night to clean my tank of all the fish poo and there is still a ton left. I took the water level down to a critical level of 1/3 tank and still didn't get all the poo cleaned out. I dont want to stress my fish too much, and put the chemical in to get the water normal/chlorine out/nitrogen level back to normal, but the water still had a lot of particulate in it from when I stirred it up. Of course, this morning it looked a lot better, but i can still see poo sticking to my gravel.