Hello I have a few problems I need some help with I have a 55 gal octagon tank it's been running 2 weeks I had 2 Opaline gourami and 1 golden gourami and one blue gourami 1 tiger barb 1 Chinese algae eater and 1 pleco and 2 mollies.....one of the opaline gourami started rocking front to back and stopped eating was like that for 4 days I changed water added conditioner now the golden gourami is rocking and my blue gourami is laying at the bottom not really moving please help all the rest move around fine eat and seem healthy