I have had an antennata lion for about a year & a half now, I got him when he was about 1.5", since then he's about doubled in size....1st off I would avoid feeding any feeder fish especially FW feeders, they aren't meant to be eaten by SW fish, but that's a whole nother discussion......as far as what to feed, high protein foods are what u need for carnivorous fish, the fact that he's already eating from a feeding stick & eating frozen/prepared food is a good thing, I feed my antennata, frozen plankton, clams, also haddock from the grocery store(haddock is 1 of the fish that does not contain thiaminase which can be harmful to predatory fish over extended periods of time), that I cut up in tiny pieces & soak in VitaChem which is a vitamin supplement, you should feed SMALL pieces & only feed enough so that you see a slight rounding of his belly, it's not good to feed huge pieces & make him look bloated, also don't feed every day, every 2-3 days is plenty......every once in awhile(every 2-3 weeks) I will feed hm about a half a cube of formula 2 which is an algea based diet just to cover my bases, I would recommend soaking his food in some type of vitamin supplemt though......hope this helps....