It won't eat nori, it won't eat mysis and it won't even eat brine shrimp. It usually just ignores the food floating past at feeding time. I discovered however it goes crazy for chaeto, gobbles it all up. I noticed it during cleaning when I accidentally dropped some in the tank. It does also graze on my rocks from time to time as you can see on the photo I have mostly film algae not much macroalgae. Also no offence but it seems kinda stupid, when it saw the chaeto it took 30s to find it because it kept chasing the reflection in the glass of the chaeto which I've never seen a fish do before. But as chaeto on its own is an incomplete diet (right?), what can I do to entice it to eat other foods?
Thank you, also it looks fat and healthy, tummy bulge after eating, it poops but not heaps, no disease, fins and breathing normal, colour changes back and forth easily, sleeps and swims normally.