Fin rot on queen angel?


New member
I have a queen angel that I have had for a few years in my 150. He is eating and acting fine but he developed some clear spots on his fins. A big piece of his fin is missing as if it were chomped off. He is the king of the tank and I cant imagine he is been nipped. Could this be fin rot? A search here and on the internet came up empty. Any help would be appreciated. TIA