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I found this stuff at the pet store- it's a calcium carbonate substrate for lizards that's fortified with vitamins and minerals.. i was curious if anyone has used it or knew if it would work as a substitute for CaCO3 in a casing mix?  The ingredients are listed below and here's a link for more info: http://www.reptilesupply.com/product.php?products_id=643

Ingredients: Calcium Carbonate, Magnesium Carbonate, Iron Oxide, Beta Carotene, Ascorbic Acid (Vitamin C), Calcium Pantothenate, Vitamin B12, Biotin, Vitamin B6 (Pyridoxine HCL), Niacin, Riboflavin, Vitamin B1 (Thiamine HCL), Folic Acid, Dicalcium Phosphate.

So i plan to start out with the brf tek to make cakes, and case them afterward, with maybe the 60/40 coir virm, if by then I don't find a more attractive recipe.  I'm using 1/2 pint jars and i'm casing in 4" aluminum roasting pans, 2 pans in each of the 2 16 gallon plastic fruiting chambers.  I figure on fitting 6 cakes per casing, then covering them with the casing.  I'm going to use one tropic air humidifier and air pump per fc- i'm hoping this will provide enough fac but don't know how many holes to install in the chamber or what size they should be.  Should i put them all over the box, as the brf tek says, or just near the bottom or top for CO2 to exit?  Do i need some kind of filter for the air pump or can you suggest one that's suitable to my needs?  Thanks for any tips or input.