Hopefully, you live feeders don't belong to the carp family (goldfish, rosy reds, koi, etc). Here's the explanation:
1. The flesh of these fish contain the wrong fatty acids for SW fish, so they simply aren't as nutritious as they should be by a long shot.
2. Their flesh contains high amounts of
Thiaminase, which inhibits the uptake of
Thiamine. This deficiency typically leads to CNS disorders which typically present as clamped fins, anorexia (cessation of feeding), seizures, and an early death.
If the fish is eating well for you, the best thing to do would be to wean it onto a variety of dead foods such as silversides, SW fish flesh (salmon, cod, snapper, tuna, etc.), uncooked/shell-on chunks of table shrimp, squid, scallops, lobster, etc. These foods are all very reasonable when bought in small quantities from your grocer or local fish market.
We use a modified "stealth" feeding stick as described in
Tools of the Trade: Equipment & Techniques to Convert your Fish onto Frozen for all of our
Scorpaeniformes, including our full-grown volitans.
HTH