heh, define what you mean by "limp" like, just kind of sitting there (coral being motionless) ? If so, it needs more flow. It needs moderate flow so the tentacles are gently waving back and forth.
So if that's the problem just adjust some powerheads to correct the flow !
HTH,
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20g BB Mixed Reef // Coralife 150w HQI // AquaC Nano // Koralia 1 & Seio 820 // Jager 200w // AC50
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