Suggestions on the best way to treat fin rot in a lionfish? The water quality is perfect, and he's the only critter in the tank. We just got him a few days ago.
Fin rot? ... not just tears or holes? Providing your water--including nitrates and PH--are as good as you say, take it back to the LFS. Otherwise remove the fish to a quarantine tank and treat it with water changes and Furan products... this is often not a disease at all but a reflection of poor water and environment, but if it is indeed bacterial I wish you luck.
Yeah, it was definitely fin rot and not just tears or holes, which I know are common in lionfish.
Ammonia was zero, nitrite was zero, nitrate was zero.
We tried treating it with methylene blue, but he passed away last night anyway. The fish store won't do anything about it... last time I buy anything there.
I'm not sure what you mean. Ich doesn't look like fuzz; it looks like grains of salt or sugar. This was cottony white fuzz just on the edges of the fish's fins.