I have 3 yoyo loaches, all of which are very active... till today. I noticed one of em on its side. I would feed them and he would eat, but then go bact to laying on its side while the rest of them played. I put him in his own tank now, and have administered an antibiotic. And he seems very active now. This is all in the corse on 10 minutes... so I don't want to put him back in the 29G. No signs of sickness, water parameters are comfortably tolerable... any ideas?