I don't think they take to dry foods readily. They need meaty food and I was very fortunate to have a wonderful LFS that brings in these lions already on frozen foods. I feed frozen brineshrimp, krill, and mysis shrimp.
Most of the time these fish have been raised on live foods so when you get them they will not eat anything except live. I am so glad I did not have to go through that with mine. Very personable fish and ready to greet you when you approach the room. I am so glad to have one.