I've been following the threads for changing CC substrate over to sand, and have grown a bit confused. There are several grades of sand out there, as well as the HD stuff. Most of these sand particles are fine, <.5mm-1mm,correct--give or take a mm or two? My CC is more like gravel, which I wouldn't mind switching out, but am concerned about harming the fish I already have in my tank with all the cloudy silt that seems to be a side effect of switching to sand. What's this "special reef grade" stuff? Is it like my CC substrate? (Don't want it, if so!)
At any rate, if I decide to change, what size sand particles should I be using for this switch over?? and what care should I take with the fish that are in there now?
I have a 125g, with ~150lbs of LR
, and ~125lbs of CC. Numbers: 8.3pH, 1.023 SG
, 0 Nitrites, 0 Ammonia, 20 Nitrates. (These numbers have been stable for at least 8 mos., no matter what I do--PWC
's, which I do weekly, along with a vacuum of the substrate; adding a new fish; even after a feeding, which I do every other day or so. I even just added a couple of mesh bags of Purigen, but so far, no drop in the nitrates. )
I have one 3" lawnmower blenny, six 1" green chromis, and one 3" coral beauty, along with a bunch of snails and crabs.
Any help, suggestions, or advice is always appreciated!