I have a firefish in my 30 G and yesterday I noticed his dorsel--the big, thin fin on top that lets us know he's a firefish-- was shredded. All other fins are fine and nothing else looks abnormal.
Was he in fight -- tank mates include: 2 false percs, red stripped goby; shunk shrimp -- Is he sick? Doesn't look like fin rot IME
(but that's limited) ,so it could be. Any thoughts?
Parameters are mostly oky:
Ph 7.8 (Low I think -- see my other Q in gen discussion)
What if anything should I do??