Anything enhanced with extra amounts of algae. Formula Two, Spirulina flakes, other seaweed varieties, macroalgae (preferably not Caulerpa species), as well as living filamentous algae (some of which is probably growing in your tank). They will also eagerly accept meaty foods, such as mysis, etc., but do not turn these latter foods into a staple diet--yellows NEED lots of algae.
