Prezioso, guntercb is right, it depends on the purpose of your fuge.
A DSB, even with only 20% light will provide an anaerobic zone for denitrification, and if you can get a couple cups of sand from a well established tank, you will soon have all kinds of pods, worms, etc. in there.
So yes, it can make very good sense to have a DSB in a fuge.
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180g Reef Tank
900w 20K MH
100g Sump
25g fuge
50g grow out tank
Manifold closed loop
ASM G6 Skimmer
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