I had a lion fish 20 years ago I had to feed him live fish gold fish worked good he would not anything that was not alive. This is because they are wild cought fish it is hard to get them to change over they will literaly starve them selves to death before changing over to frozen food if they are the least bit unhappy where they are. I did get mine to eat some frozen but it took a long time and he still would not only eat frozen so i still had to give him some live fish to eat. I will not have a nouther one. They are a very nice fish and I do know a couple of people that have them and they are doing every well.
Bill