You can use and reef safe sand & crushed coral.I used some reef sand that I purchased while on sale at petsmart & crushed oyster shells from a feed store.The crushed oyster shell is about $3 for 25lbs.
My lfs has sand of different sizes for sale in bulk. I'm sure they just dump bags of aragonite and such into buckets and sell it for more per pound. I only needed a few pounds so it worked out well. I would say that any sand would work. I spinkled on small grain and then a few larger grains.
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