Juvenile Atlantic blue tang getting brown marks/ lines , nothing has changed in tank, ato/awc, functioning as normal, parameters are good no ammonia, no nitrate, specific gravity, 1.024. Ph8.1. Calcium alkalinity magnesium. Everything is with-in normal Nothing else in tank is showing signs, clown fish are OK mandarin goby’s good everything seems OK. Corals seem ok. Noticed these Marks started on Saturday. Changed out lighting. Two weeks ago back to ugly stageish lighting in acclamation mode went from 2 ai primes to 2 ai 32hds Will add primes back in later.. as I move forward… tank has been set up for 4 months with live stock 55 gal brute for 6 months with rock sand did a bright well start up Any ideas?
