I have used 1 per Gal in my tank in the past it was fine if your having Algae problems you might want to look at cutting back your light period and having that many crabs depending on how big they get could mean trouble as they start to fight and compete for food just my two cents
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(15  0 Gal reef) profilux ll controller, 2GHL LED strips, 2 Hamilton 250 W MH, 5-2' 65w T-5's, 2 6100 Tunze's, RC 135 Euro Reef skim, dual chamber Calcium reactor, marine tech kalkwasser reactor and now zeovit
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