Lions are not known to eat corals but will eat anything large enough to fit in their mouths so the vast majority "traditional" reef fish would be out as they would be a very expensive lunch for him. they are also eating machines and produce a ton of waste which in definately not conducive for a reef tank.
Any fish that will fit in your 50 g reef will be lunch. They will try to eat any fish that moves, sometimes large enough where they end up killing themselves.
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