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JRCastro.
I have a 29g, and have had good success with a 4-5" DSB. You do lose quite a bit of space/water volume though, however its great for the additional nitrate reduction. Haven't tried just using LR to compare it against though. I normally have a couple anenomes BTA, a couple of Ocellaris, 3-4 shrimp, lots of softies, snails, scarlets, etc.
The only time I started having a problem with Na was when I had a small/med Yellow tang, Coral Beauty, and a goby. Couldn't keep Na below 20-30 without weekly water changes.
Had a minor accident, which wiped out the fish and shrimp... However back to 3 anenomes, Ocellaris and 1 shrimp at the moment and Na are still at 0.
Consider the DSB a great sponge, and disposable. In 4-5 years if you have to, you can always replace it. Next tank though, I'm trying a 1" SB with more L/R to see if it will work as well as the DSB.
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