Angel 1,
I have experience with Yellow tangs. They are very territorial and can cause problems if they are added before less aggressive fish. I am working on restocking my tank and looked at a Kole, but the wife wants more color. I have always heard good things about the Kole, but I would not recommend what I have not kept before. Hopefully other reefers will post their success with Koles or any other tang, Purple, Convict, Chevron, Sailfin, Naso, .... the list is endless.
Regards,
Dave
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Jesus said "Follow me and I will make you fishers of men".