For hardness and pH maintenance. Use filtered water as you do not want the sand to become biological.
Aragamax is the product for a fluidized application. I also use this as a substrate as it is perfectly smooth and round and the fish love to pass it through their gills as they look for food. I put a fine layer on the bottom of my out door ponds too:
http://www.fosterandsmithaquatics.com/product/prod_display.cfm?c=3578+9805+7321&pcatid=7321
Florida Crushed Coral is the product I use in box filters or media baskets(make sure it's caribsea as you don't want real crushed coral as it only starts disolving around 7.2):
http://www.fosterandsmithaquatics.com/product/prod_display.cfm?c=3578+9805+7322&pcatid=7322
Aragamax is the product for a fluidized application. I also use this as a substrate as it is perfectly smooth and round and the fish love to pass it through their gills as they look for food. I put a fine layer on the bottom of my out door ponds too:
http://www.fosterandsmithaquatics.com/product/prod_display.cfm?c=3578+9805+7321&pcatid=7321
Florida Crushed Coral is the product I use in box filters or media baskets(make sure it's caribsea as you don't want real crushed coral as it only starts disolving around 7.2):
http://www.fosterandsmithaquatics.com/product/prod_display.cfm?c=3578+9805+7322&pcatid=7322
