So I'm new to the saltwater community, this is going to be my first tank. The tank is (L)140cm by (H)60 by (W)60 with a sump that is 120cm by 50cm by 45cm. The tank is going to be a reef tank, for stocking im going to have 2 clowns, 3-5 chromis, 1 copperband butterflyfish, 1 kole tang. What other tangs can I keep with the kole tang, I was thinking maybe a purple tang but they're a bit on the pricey side, what tangs would you recommend??