I would be ready with a broad spec antibiotic for the very common mouth infections. That seem to plague this fish. I might even preventative oh start treating it now because of how quickly the infection seems to spread.
Just my 0.02.
Do these fish do well in a 4ft tank or do they need more room?
A 120g size 4ft would work better that something not as wide, but like everything else in this hobby... Bigger is always better

for anyone interested (the answer is yes, and i think its recommended) however i seem to be screwed as i cant seem to find it in canada!!!!!!
canada is not reefsafe!