The filter sponge, chemi-pure, and filter balls are in the overflow chamber? What all do you have in the second chamber then? I have the filter sponge in the first chamber, two biobags in the 2nd chamber and heater and return pump in the third is there something wrong with that? You really think i should move a fish. I'll try doing the weekly water changes. I really been searching for the mods but there isn't any anywhere . Do you have everything stocked Kerrnel?