deep sand beds shouldn't be stirred.
shallow sandbeds probably should be stirred.
if barebottom you catch a break on this maintenance as long as water flow is good along the bottom 
(A DSB is a deep sand bed of 4" depth or greater)
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some common aquarium nuisances: Bryopsis,Derbesia(hair algae),Cyanobacteria(red slime), Diatoms(golden brown algae), Dinoflagellates(gooey air bubbles),Valonia (bubble algae)
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