[howdy20012002]

is this the same tank that you want to put the acro's in?
If it is, a small tank with a anemone and SPS will not work in my opinion.
All anemones sting to some point and like to move around.
SPS don't like to be stung and can react negatively to it (ie..die).
just my opinion, but I don't think you should have both in the same tank.
BTW, not all stores suggest 1.5 - 2 lbs per gallon. I think it is more personal preference and I think that the suggested norm is about 1 lb per gallon.
I dont' think however that by putting alot of sand in you tank is going to do anything for you except take up space. BTW, you can buy 50 lbs of playsand at homedepot for about 4.99
For a small tank, say a 20 gallon, 15 - 20 lbs of rock isn't going to cost all that much....there are times you can buy it here for 3.00 - 5.00 a lb.
I think that the typical 20 gallon tank would be sufficient for 2 clowns and an anemone.
anything smaller than that will be a bit small for the clowns when they get bigger...as well as the anemone will grow as well.
HTH
Neal