This platy is about 8 months old now. He has been living with danio Glofish that have all died from the same disease (curved spine, sunken stomach). After all those fish died, this baby is the only one left in the 20g tank. Over the past two months, I started noticing the baby getting the same deformity like the glofish. His stomach is slightly sunken and his tail sort of point upwards. I did one round of the API General cure to try and help it, but I haven't noticed any difference. The symptoms of wasting disease seemed to be what it has, but I have never seen it have white feces (although i have never seen it poop either). Does anyone know if this is the wasting disease that cannot be cured or if there is anything else i can try to help my fish? all my water tests have shown to be good conditions, although my tank does not include a heater. Could not having a heater for the fish have anything to do with this.