I did this in my 55 fowlr to save a few bucks and have regreated it every since
Then found the forums and learned that only certain types are "safe"
luckily I have had no major probs as of yet :cheer:
But am moving very soon and cant wait to get that crap out of my tank and switch over to the black and white sand, your inverts and gobies will stir it up making your tank look very cloudy, I also mad the mistake of now matching my play sand and LS so it was an obvious defference, hope this helps
IMHO its worth the extra $$$ now than the hassle later