I just set up a sand substrate tank for my rays and I just took the sand out of the bag and put it in. The tank has been a little cloudy for a few days now but is getting better. Then I thought maybe this ***** has chemicals or something in it and I should have washed it first. Bag says right on the front "no chemical additives or substances" but you never know. Right now the tank is cycling with pbass. Should I drain it and clean the sand or let it go??