u/Aggravating-Apple-70

It's been 3 weeks already after i got my albino senegal and endlicheri bichir from local seller until today this thing happened. 2 days i try to feed my albino Senegal but it not eat anything until today i saw him in this condition with that green or blue color spot on the stomach..

My endlicheri still in good condition and eat well.

Does anyone know what could possibly be the reason for my bichir to be like this? Can my bichir survive this??😭 I am new to the bichir community (sorry for my bad English)