substrate

Try pool filter sand or coarse quartz sand at hardware store, pool supply, equipment rental outlet store. May be too fine for what you like but it's worth a look.

ddayton21 said:

im looking for a cheap alternative for gravel sold at chain pet stores such as petco....i want a fine white gravel but the bags are about $15 for the amount i need....i know, i know i'm cheap but im not made of money lol

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The best stuff I have seen and that I use is the sand/gravel from Red Flint Sand and Gravel. You can get it at sand blasting/filter sand supply places. I am talking about industrial filter sand, not pool sand, though a pool supply place may carry it as well.

http://www.redflint.com/

This stuff is great, I run the .80 to 1.2 mm sand(it's actually more like micro gravel).

From what I read on their site the Aquarium at the Mall of America uses their sand/gravel.

Check it out.

Are you going to grow plants in this substrate?