naso tang kicked the bucket

Can anyone give me an idea of the most common diseases that a tang could get besides ick. The fish had quit eating a couple days ago but seemed to be aciting normal out side that. He always followed me around the tank, and when he was ok I could hand feed him. He didnt show any other signs besides not eating. I dont think it was ick because I didnt see any white specks or show the signs of ick. Had him for about 3 months till now. and Ill give the tank mates and water readings.
tank is a 225, with a 100 gallon sump plumbed to the basement.
around 250 lbs. of live rock
tank has been up a little over a year
last water change was 2 weeks ago, about 50 gallons which I do every 3 weeks.
temp. 77
salinity 1.024
ammonia 0
nitrates 0
ph 8.3
cal. 445
mag. 1350
tank mates: emporer angle, 3 yellow tangs, s.sailfin tang, fowface, 2 clowns, bower shrimp&fire shrimp, lawnmower blenny, about 60 hermits.
corals: small amount, or for my tank
devils hand
leather toadstool
zoas
kenya tree
about 10 diffrent sps (sorry dont know all their names)
frogspawn
hammer
gsp
xneia
I hope I have covered the everything, all the fish have always seemed to get along, no bullying to really speak for.:-/
thanks everyone.

 

sorry to hear. How big was it? Sometimes they just go and have no explanation. sorry for your loss..

 

probly around 4-5 inches. not the smallest in the tank but not the largest.
just sucks losing a fish, they all seem to have their own personality

 

If there was no signs of stress on the fish from the outside, I might suggest internal parasites or issue possibly. Or just the fishes time simple as that. Sorry to hear about the loss.

 

Sorry to hear about the loss!

 

see what I dont undestand is the last 4 fish I have tried to add over the last 7 months have died. 2 from ick, and the other 2 like this poor guy. gets kinda expensive dropping $45 on a fish each time.

 

lol Try loosing an Achilles tang at the mad price of 200$ a pop... Thats a fun one. Im on my 2nd one. This one however has been with me since the begining of November of 09.