yellow tang /brownish stuff

[u571]

on my tellow tang he has this like brownish stuff on some of his fins and on his back any ideas what it might be? also he seems to be bullying all the othe fish in the tank around , he floats next to them with his sharp tip almost like hittting them (1 firefish,5 damels) thanks

 

[noaquariumyet]

hi you should post this in the disease and treatment forum for the brown stuff....but as for the yellow tang being the bully...that i perfectly natural...yellow tangs are naturally more aggressive than the firefish and the damsels although damsels are sometimes pretty aggressive...i take it that the yellow tang is larger than the damsels???