2 African Cichlids. Milawi. The Electric Blue cichlid is slightly larger than the pleco but leaves him alone but the smaller albino likes to bother the pleco. The heater is not covered but I never see him near there, he’s usually just behind the filter tube. Ill dose MelaFix and PimaFix for 7 days and see if it helps. My other concern is that I don’t think the pleco is eating. All day he stays behind the Filter tube and only moves up and down in that area. I’ve tried Hikari wafers and Zucchini but neither ever seems eaten