Any advice on additional fish

[dvk]

I have 110g, Amiracle 300, Emperor 280 -- two, Hotmagnum 250, UV-15, Berlin HO.
Yellow tang (medium),
Percula Clown (medium),
Coral Beauty (medium),
Koran Angel (small),
Neon Damsel (small),
Blue Fin Damsel (small)
LR,
Clean up crew.
Any advice what fish I can add? I realy like tangs (hipo, naso, convict, orange shoulder) but I know it can be big problem. Any success stories? What should I do?
Also, my Koran Beauty has some "salty" crystal looking substance on a tail. What is it? Do I have to do some treatment? Other fish looks good and I do good maintenance.
Thanks

 

[fshhub]

take a good look, could be ich
if so, quarentine immediately and treat the fish(probably fishes)
as for fishes another percula
maybe a wrasse
or blenny
bengaii cardinal
hawkfish
youstill have several possiblities since your tank is so large and the fish you have chosen are not too awfully aggressive
you could even go a little more aggresive if youwant, you definitely have plenty of filtration, in fact I would loose some of it personally

 

[dvk]

Thanks, I will quarantine my fish. Hopefully, I will recover it with no additional problems. Do you know if I can add any Tangs after I complete a treatment?

 

[fshhub]

i wouldn't IMO one is enough for a 100 gallon(give/take)