I got a foxface rabbit fish about 6 weeks ago and have it in a 29 gallon quarantine tank ever since I got him. I keep the salinity at 1.015 to help kill any saltwater diseases. But I noticed that his tail fin keeps deteriorating slowly so I thought he had fin rot, his fins are slightly red on the edges like their irritated. I've been treating the tank with Maracyn Oxy but that doesn't seem to be working. He still is eating great!! Please let me know if you've seen this thanks.