helloooooooo, i am new to keeping tropical fish and i have had a bit of bother with 2 of my fish. I have a t-barb that is 4 inches big and a chillcard which is 3inches big and is new to the tank . the chilcard(please excuse spelling) has been nipping the t-barb 4 2 days band now the t-barb is swimming upside down i have separated them and quite concerned about my t-barb asto why he is swimming upside down?