I have used pool filter sand on at least a half dozen tanks and have never ever had any issues.
I also have a silicate test and have used it at different times to see if anything leeches out and so far nothing. I always use the pool filter sand from home depot though, the same brand and type every time.
I just set up a 180g tank a few months ago and used about 200lbs of sand for it, if I had not gotten pool filter sand which was only $20 it would have cost me over $200!!
BUT if you want real sand, I just got a delivery today of aragonite sand, pre-rinsed for $25 for 40lbs from The Reef Rock Store
. Good company and good sand and rock too.