I recently went to all pool filter sand in my tanks and would never go back...Its cheap, heavy enough not to get sucked into your vacuum even when stirred around, and it looks awesome. My cichlids love it and dig for hours in it. If you have hob filters either use the sponge prefilter or keep extra impellers on hand..I only have that problem in my oscar tank because they kick up more sand. easy to maintain and looks way better than rocks IMO