Hi Afsal - many people would say yes, others would say "no".
Personally - I don't siphon the detritus in my tank's sump. I don't even siphon in the display (I have a DSB in my DT).
I do "stir" the top +-1 to 1.5cm of the DSB in my tank though. I have far too much live rock in my sump, to allow me to "stir" the top +-1-1.5cm of the DSB in my tank's sump.
I cannot get to the DSB.....
I see the micro fauna, that lives in and around the detritus, as food for my corals, and my fish.
BTW: I only suffer from aptaisia issues - not nuisance algae issues. And my water nutrient levels are always zero (ammonia/nitrite) and nitrates/phosphates very low.