I have 6 tiger barbs, 1 red tailed shark, and 1 pleco in a 75 gallon tank. They all have great appetites and are usually quite rowdy. I have 1 tiger barb, however, that isn't acting right. The 1 tiger barb floats vertically, at an angle, with it's head down. None of the other fish are doing this though. The tiger barb is eating good though and other than that does not show any signs of stress. The younger barbs we just added are also doing fine. This one that we are questioning though is the one that gets chased around the most though. I can't seperate this barb because our other tank isn't quite ready to add fish to yet but should I watch for anything else?