One male platy about 2 years old. Found sitting at bottom of tank a few days ago and not eating. Placed in QT with aquarium salt and General Cure. No external signs except clamped dorsal fin. Maybe bed back to main tank yesterday as his son was stressing without him. Has remained in back corner since then, now at the top and not eating. Parameters are 0, 0, and 20. Just cleaned tank on Monday. Doing a pwc again. Kh 72.6, GH 161.1. PH. 7.5. Here’s a pic. Note: just noticed lips are a little white and not closing mouth all the way. Any ideas?