I just added a little bit of quickcrete playsand on top of my caribsea arag-alive aragonite. To be honest, I don't see much difference. Its a little greyer/darker than the caribsea but not much. It is much finer than the caribsea stuff except it has some larger particles in it. The only drawback is that without the aragonite the quickcrete will not aid in tank buffering. Just my 2 cents....