Get the fish some decent food...freeze-dried anything just isn't a good diet for fish, and krill has been linked to lockjaw in many predatory species, especially lionfish.
Additionally, FD krill becomes addictive, and once most fish get hooked on it, it is difficult, if not impossible to get them off the stuff.
A good, varied diet of fresh or frozen seafood is the key to a healthy lionfish.
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