05-26-2012, 12:37 PM
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I'd personally never use Tums.. I use calcium tablets every so often. Try to find one with magnesium in it as well, and drop it in whole.
I drop a half-tablet in once or twice a month in my ten gallon, but you could probably get away with much less.
What's your PH? If you don't mind the PH rising a little (6.8-7.2), you can buy agricultural limestone extremely cheaply, and add 1 TBSP to the substrate.
Some vegetables have fairly high amounts of calcium, but spinach, rhubarb, chard, and beet greens all contain Oxalic acid which could 'lock up' the calcium.*
*Oxalic acid prevents mammal digestive systems from absorbing a lot of the calcium. I'm not absolutely certain how Oxalic acid would affect calcium absorption in an aquarium.
Last edited by redchigh; 05-26-2012 at 12:41 PM..