I've used Caribsea Special Grade and MarcoRock's sand in the past, and was happy with both. If you plan on having high flow for stony corals, then MarcoRocks sand will likely pick and blow around as its pretty fine sand. However, the price point on MarcoRocks sand is hard to beat.If you're willing to buy dry, Caribsea does have a bulk pack that is priced on par with Marco.https://www.bulkreefsupply.com/aragonite-special-grade-dry-sand-40lbs-caribsea.html