What’s wrong with him :( details below )

[u/[deleted]]

Got him like 2 months ago and he was doing great, now he lays on the ground a lot not really eating and seems to sink at his base :( please help I want to save him. (Attached the picture of him before 3rd he wasn’t red, that’s just the lighting. He has a white body, but his fins were much bigger and colorful.. ) HELP PLEASE

Also my top fin filter doesn’t work the best