I can't recall the brand... I want to say it's Caribe Sand, but one of the Brand names has an Activated "dry" bacteria, which also serves as a clarifier.
I was really pleased with those two out of the three bags I had to buy recenty. One bag wasn't that brand.
(And I replaced all my Old sand too, rather than recycling it, when I went to the bigger tank. Something about not wanting to pull over old sins, namely Bristleworms.)
Aquatic Critter in Nashville will also have it if Memphis isn't in your travel plan.