hey-- as long as you have extra bags, put more in... its great sand, but you MAY notice that if you don't watch your Ph, you will lose some depth over time as it is dissolved. Some people may say i'm crazy, but i lost 1/2 inch since i started mine 6 months ago. I used 150 pounds, and 20 pounds of LS. I have a 5-6 inch DSB. If you end up to shallow, it does not work, the only drawback to going too deep, is less room in your tank
just my 2 cents....
So pour in half of one of those extra bags... just to be on the safe side...