RE: feeding volitans lionfish.
I have had mine for a month now and only feed him in the day time, and only when he comes to the front looking for food as part of having him trained so he will be active in the day instead of its natural dawn and dusk. I feed him as much as it takes to see a good bulge in his guts...and he still looks for food more than once a day, and will recieve it if he looks like he can pack it in! perhaps this is why he has double in size in the month I have had him. he is in a 65g tank with very little live rock, half inch of aragonite, and a fluval 405 canister with all chambers full of biomedia. I have yet to do a water change and have no problems with ammonia or nitrite. nitrates below 10ppm and no algae problems even though I run 2 30 in vho lights, one 10k and one 6700k ( thats just what was on the tank). I have been feeding him sliversides, gut packed african cichlid fry( have too much) , krill, and sea food mix with squid,octopus, shrimp, oysters, clams, mussles. I even dropped a small chunk of frozen mysid shrimp and he had himself a shrimp popcycle to my surprize.
anyway, just my 2 cents