it may just be my over stocking nature but i think you could do 2-3 of the flies in that tank, but before you do anything, it's usually best to just wait and see how you fish grow.
besides i don'tmean to force the idea on you i just think that they'd be kickin' in that tank.
Nope i THINK thats subliminal (sp) I have the Vlamingi, Naso and Regal. I think yellows are hit or miss really. I would LOVE to get one but I am too chicken to see if it will bully my other tangs and stress them out. I guess you could always try it and see but it things get to out of hand at least you have another tank to put them in.