New clown is currently in QT for the last 2 weeks for observation. I noticed this growth on the anal fin. Any idea what it is and how to treat? I have another clown, bicolor angel and a foxface in the QT with him. They all look healthy. All parameters are good with the exception of ammonia that is 1.0 but I will be doing a 50 water change in the am. No sand just a HOB filter with media in a 10 gallon.



