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Goldfish are horrible feeders, usually disease ridden. Not to mention they probably should not be fed to a sw fish/ lionfish. If you need to feed live try ghost shrimp or get some frozen silversides and feed them pieces of that on tongs.
feeder shrimp would be a good alternative if you have a spare tank around to breed them in . I had very good luck breeding saltwater feeder shrimp , live minnows is another choice but they can be expensive