I was told by my LFS that I can use regular play sand as long as it is washed and sifted. He also advised to put the sand in boiling water first.
regular silica play sand is useless in a sw
aquarium and should be avoided without question as it has no value in terms of PH
buffering and biological filtration
What sand type can be used? Is aragonite ok?
yes, you want to find aragonite based sand, not silica playsand
, i just found this in a prior post...looks like 14.95 for 40lbs aragonite reef sand
they have a pretty handy calculator there too