i have a red eye tetra that i'm afraid has TB.the tank is a 20 gallon with 4 serpae tetras, 4 red eyes and a BN pleco. a few days ago i noticed that one of my red eyes caudal fin was curving slightly to the right, upon closer inspection i relised that its spine apeared to be curved that that way.its still eating well and is able to swim fine but i know somethings wrong. is this TB?