sand

[OxyBomb]

my home depot only has one kind play sand. in a couple weeks once my tank has cured (had to fix a couple cracks in it) im going to try the sand thing. its like a 10 pound bag for 3 bucks I think. not as good a deal as your guyes. how deep do you want the bed of sand?

 

[got_nailed]

If the sand it to thick it can build gas bubbles in it. I would go with about 1 ½ inches or less.