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I've got 5 hydra 52 and 2 vegas on a 10' long 30" wide and 26" deep tank. I have plenty of coverage and no problem growing sps throughout.
If you are referring to 30 inch wide then i think it's more than enough. I have a 32inch wide tank by 30 tall and 27 deep. It's well more than enough.
I'm running 3 on a 72x24x30 with a 60" 4 bulb T5 fixtureDo you have a pic of tank and light configuration? So 4 would be good on a 60 or 72 long tank?

