Have anyone came across a lionfish with fin deterioration? what cure works? i have a 4 inch Volitan lionfish (reddish oranges color) in my main tank for like a year now. I got a new yellow one about 3 weeks ago. He is about 5 inch or so. I FW dip (6 min.) it before putting it in the QT. Was very healthy looking and eating well from the start. No sign of injury or illness. Until two days ago I notice one of his fin is almost falling out. Don’t look like a physical injury like from netting. Looks like some kind of bacterial infection. Like the bone structure (don’t know if this is what it's call) that hold the fin is deteriorating (sinking and weakling) at the point where it’s about to break off. i'll try to get a picture