Should this be done? I noticed when I stirred up a small section of sand it emitted a lot of dirty brown water its about 3" deep water tests normal but I still don't think the sand should be this nasty took my tank about an hour to clear up (90 gallon with 600gph overflow to 55gal sump and nautilus ex 24 protien skimmer) I have one sand sifting starfish and a tiger cucumber lots of tiny hermits.... should I vacum some sand on water changes? Get more sand sifters and cucumbers? Or not worry about it?