i have decided iam going to use sand for my mawli tank.whats the best kind i was thinking pool sand. but ive heard you can get a black sand i think it was refered to as sand blasting sand and for cheap. and were could find a lot of slate in atlanta.i have did some serches on the net but keep comming up with roofing companys.one more question i dont want a sand thats going to cloud up my water i heard that play sand is natoriuos for that.and will i need a powerhead on an african tank.TIA