Thanks eveyone. Doug I don't know how many lbs I put in so far, but I'm in my 5th or 6th bucket fulls and I'm about 3". I need some more since I want to cover the 2nd mesh and would like to be in the range of 4-6".
My cousin send me some sand from Mexico, but its a couple of shades darker than what I'm using and really don't want to mix it with what I have already in the tank.