My female Ocellaris clown fish which I have had for 3 yrs with no problems has suddenly developed swelling on one of her gills. She eats fine, moves fine and continues to lay eggs every 2 weeks as if nothing is wrong. I have not had any parasite problems for years now and have not added a new fish in like 2 yrs. What could the cause be? Any thoughts will be greatly appreciated.
Regards
TS
Regards
TS