Patrick, since you have a crushed coral substrate, you'll probably be safe stirring or vacuuming your bottom. If you have a DSB, most people would recommend against stirring it as this disturbs the layering. If you've always stirred it as Beverly claims, then you probably don't have the layers to disturb and therefore won't suffer the algae blooms.
The point of a DSB is to create anoxic areas deeper in the substrate for NO3 conversion; stirring negates those benefits.
__________________
Brad
|