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I used soutdown in my last tank but, the stuff is not to be found anymore. I used sakrete premium grade natural sand from Lowes on this tank and noticed no differance then the southdown. No differance in the alge or anything else. Works fine and costs next to nothing. If you need 250 lbs of sand that's about a pound per coffee grinder. Humm 250 coffee grinders could run into a lot of cash!!
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