Since the shallow depth, you could raise an LED fixture quite high to increase spread and still have plenty of PAR. I would be leaning towards a Hydra 26. What type of corals? If SPS you might want something stronger (if you mount it extra high), but I imagine you would do fine with a Hydra 26 with SPS even if it's mounted high up.
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~ Mindy
SPS fanatic.
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