Well with a 120 gallon tank in a 4' I would go with 3 and with a 6' you could do 3 or 4. It looks like they will cover close to a 24"x24" each but you want to have some over lap like sprinklers in your lawn. This should let you grow just about anything you would like.
One other thing you could talk to Bill about his LED's for just a little more he can make you a great 4 color system I have read alot about reds and greens helping some types of coral. here is a
link to one of his adds on KSL. He is a really nice guy and very easy to work with.
Edited by lskurys - June 22 2012 at 1:13pm
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