Hi guys Bought the tang few days ago and my yellow tang is trying to kill the poor guy. I placed my yellow tang in the sump for a while and when i added him again this morning he went after the Purple Tang Collection only. I still have to catch the little bugger. He is about 7cm in size. Awesome size as jou can have him for a long time, well thats what i though when i bought him. I asked the wife which tang should stayband she said the big yellow one R1700neg.