My fiance wanted black sand in her new cichlid tank we are setting up along with 50+ lbs of rocks. My questions are, Do i need to stir the sand up occassionally? Im guessing yes. And during gravel(sand) vacs do i HAVE to move the rocks? I hope not b/c she spent over an hr arranging them the way she wanted heh. Im hoping i can just stir the sand and force the stuff i need to vac out from the rocks with some current. Any advice would be appreciated. Thanks =)