It's hard to have too much light. You just have to acclimate the corals you get to your lighting.
I have 4 halides over a 6 foot tank. Most people run 3 halides on a 6 foot tank to have one every 2 feet. so my set up is
400w 20k------250w 10k------400w 20k------250w 10k
Now keep in mind my tank is mostly all sps corals
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No matter what the morrow brings, inventors keep inventing things.
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Jonathan
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www.cakerybakery.ca
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