that should be fine. For a DSB to actually work as designed it needs to be 5-6inches deep. With enough LR you should be doing fine.
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Some people are like slinkies...they serve no real purpose yet can still bring a smile to your face when you push them down the stairs!:p
Have a great day! Brian
Opinions vary on DSB almost everyone i have talked to friends and people in the bussiness have said good or bad things about them. I have about 3-4 inches in my 125gal and i think thats plenty.
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" 'TAP TAP TAP'...Here fishy fishy fishy"