im saying under the rocks sometimes poo and other things (well nothign else casue u dont have real plants in there, or do you?) but anyways, i dont know how it gets under there but sometimes it does, happens all the time under my cave, which i would like to say i just redid todayfreshmike said:The rocks are completely clean, 4 plecos in there....the gravel is clean as well.
Maybe I will try the extra filter...although I don't have any carbon.