Here are the pictures of my FlowerHorn. Please someone tell me, is that fin rot disease ? I have done 80 % water change yesterday because he was not eating well and was kinda less active. But after water change, his hump has shrunk a little bit. But today, he has returned to his normal super active side. But I have noticed this some fraying of fins. Please need an expert advice, is it really fin rot or I am thinking much..? Pls help. 
