I'm very cautious when it comes to putting things in my tank that aren't MADE for fishtanks.....truth be told I'd rather spend 25 bucks on a bag of "aquarium sand" than risk killing everything with some 5 dollar home depot sand....but today, I'm stepping out of my box. I'm having trouble with plants staying planted (mainly microsword) so I'm adding sand to my substrate. Went to home depot, and bought a bag of pool filter sand....rinsed it to death, water runs clear. Is there ANYTHING else I should do to this stuff before I start putting it in my tank? Is there ANY chance that its going to do something funky to the water and kill all my fish?