I’ve had a synodontis eupterus for almost 4 years now. About a month ago, I transferred him from my 55 gallon to a newly cycled 75 gallon. I gathered my own driftwood from the banks of the Mississippi and treated them thoroughly before putting them in the tank. I have added 5 Congo tetras, 3 Roseline sharks/Dennison’s barbs, a juvenile Bruno pleco, and a rope fish to the tank. My synodontis has been hiding a lot in a cave structure I assembled. Recently I’ve noticed his adipose fin is much paler than the rest of his body. He still eats and swims normally when he’s not hiding. Could this be a sign of sickness? If so, how should I treat it?