Not sure platies are chichlids, but I'll post here anyway. I have one male platy and 3 babies (~3.5 months old). Female died about a month ago, one baby last week. It was smaller then the other ones, weak, no appetite. Remaining babies look OK, but the adult male became very thin and skinny and developed a bent spine. They all rub their bellies to objects ocassionally, in fast and curvy moves, slightly tilted aside. No spots nor dots. Checked the disease article, bent spine points to tuberculosis, euthanasia recommended. Generally, they are active and feeding normally, I would say. Any suggestions?