Okay i have 3 minnow, 2 black neon tetra, 1 juvi convict female with my red ear slider turtle in my 55 gallon. Recently i have seen 2 of the minnow rubbing their side on the bottom of my tank. both of them had white stringy poop about 5 days ago. my other fish are fine. no flashing wadsoever. im feeding 3 times a day. all of them very active and eat well. so whats the problem?