my tang is sick plz help

[JKDMan]

my indian sialfing tang is looking kinda ill at the moment,

he has small spots of discoloration on him ,not ich tho i know what that looks like also his dorsal fin has some discolored areas between a few of the spines
and i also noticed a tear on its tail fin

when i noticed the fishs' condition i checked the tank temp and it was a tad high so im thinking that this could be a stress reaction the water was at 84f
its still eating and behaving normally


any ideas
plz help

 

[JKDMan]

the tank is a 220 gal with about 250-260 total system volume
the temp is usually 80 at night and 84 during the day
the tank is open with a fixture on top 3 250w MH + 4pc
tankmates are 1 tomato clown 1 cleaner wrasse 1 majestic angel
1 royAL gramma 1 mandarin

 

[JKDMan]

all the parameters are good 0 ammonia 0 nitrate 0 nitrite 8.4 ph

i kept my MH of today and the tank stayesd around 80 all the marks on the fish are gone , i think i may need a chiller

 

[Ef3s]

6 fish in a 220 gallon?!?!

 

[brandonberry]

Tangs are notoriously subsceptible to trematodes. Often these will cause discoloration and what look like little scratches on the fish. Prazi-pro will treat this effectively. If this is a reef tank, definitely remove the fish and treat it in a seperate quarantine tank. There is no guarantee that the other fish won't carry the parasite and cause the tang to be re-infected when you put it back in. You may also want to try a 5 minute freshwater bath with 1 drop of formalin per gallon. This is helpful with a lot of diseases. I do this with all new fish that I get. This is also the method that the NC Aquarium uses on all new fish.