ideally, if it was me, I would go with 2 fixtures on a 48" tank. The better light coverage should be beneficial to ensure corals are getting lit equally and reduce the shadowing effect. You can always dial down intensity, you cant increase coverage.
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My reefer 450. I was going to go with the ap700 myself but 5 foot tank would've needed 2. The lights amazing when it comes to lighting the tank but unfortunately it's still not tech savvy. No apex support and only can be run by an iPad. @rage1199 talk to him about maybe making a deal on one.
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