Caribsea aragonite oolite sugar sand 30lb 1363kg caribsea aragamax aragonite oolite sugar sand is a calcium rich aragonite marine substrate packed with beneficial bacteriar caribsea aragonite helps to create a natural biological and mineralogical balance to discourage nuisance algae growth and promote healthy fish and invertebratesr controls nitrate nitrite ammonia and other wastesunsuprassed buffering capability helps maintain a proper ph of 82 without the constant addition of chemica