ok substrate test inprogress.

[canadawest]

Well I've had my 10 gal refugium filled with 4" of dolomite for 2 weeks now, and no detrimental effects on my tank thus far. I also put about 5lbs of it on top of my aragonite in my main tank, and again, no worries. (Took about 5 hours to settle with the powerheads off and skimmer on)

I personally think the stuff is excellent and for only $3!!