Ya I've had 3 bloodfin tetras for a long time, and they have all been really healthy. Today, I was counting them and I only saw 2 of them. The third one was hiding in a corner all by itself, not ever socializing with the other tankmates. Then, when I fed them today, it wouldn't eat anything. It just sat in the middle of the tank watching the other fish eat. Then after they were all done, it swam back over to it's little corner. So, does anyone know what the problem could be of why it's not eating? And my tank IS established and all water readings are good.