Thanks for all advice.Yes first i was really depressed.But i decided not to gave up!!!!I was so depressed because i knew how hard it is gonna be to catch all fishes if i have to.It would take me probably about 3 hours to take all corals and rocks and catch all fishes.I decided i give one try.In one hand flakes close to the surface,second a net.They come close for food,one scoop and i got him!!!!!!I got so lucky.I gave him formaline dipp<first time in my life> and put him in quarantine tank.All fishes in display tank looks great.Today he is happy,eat well,no black spots.Here is my question.I m prety sure that stress was the reson.After i put the flame angel <2 weeks ago>he fight with her for 4 days and never accept her.Since then he was nervus you could see that.So how long should i keep him in QT.And should i ever put him back to desplay tank?It is gonna be the same story.Flame angel is still there.Or should i gave him back to some lfs
to avoid problems.What would You do???