In my experience, tangs LOVE caulerpa. It's one of the best things for them since it's their natural diet. Around here, caulerpa is expensive, but next week I'm going to give them a treat and buy them some caulerpa. Our yellows are pigs also and will now eat anything. All our fish get mysis shrimp, omega 3 brine shrimp, marine cuisine, emerald entree, squid, and algae sheets. And yes, the yellows deff eat squid!