Sailfin shedding weight

[Capt_Cully]

Ive had it 7 years. It started out in a 72. Went to a 180. Then spent a year in a 1' deep x 6' long frag bin. Now been in my 200 about 2 years. I suspect its not doing well in the 3' x 4' footprint now that its grown quite large. Twice the size of my purple & tomini tangs. It doesn't really get to spread its wings like it can in a long tank.

I've always only fed frozen mysis. I've tried flake, pellets, lettuce, nori, greens in the past to no avail, but never really cared as all the fish were fat & happy, and the salifin was the fattest. Lately its been shedding weight and I'm concerned for sure.

I can't control the tank size. I can feed whatever you fish pros recommend. I can help you with water conditions and coral all day long. Aside from compatibility and some basics, I'm not well versed in fish problems. In fact, this is the second or third fish I ever purchased. (I maintain mine is a coral tank with fish in it, not the opposite)

Any help?

Still good appetite. No new additions to tank.

 

[Terra Ferma]

Mysis can make them fat and happy - but it probably doesn't have everything an algae scraping fish needs to do well. Try soaking the mysis in a quality fish vitamin and feeding it some nori or nearly 100% based spirulina food (a lot of the spirulina stuff is mostly fish meal - Jehmco makes a good 99% flake).

Other than that...could the fish just be old? I've heard of angelfish (at least) living 20+ years in public aquaria. But those are different conditions. And with a somewhat incomplete diet - that could certainly reduce its life expectancy.