I just had a soft shelled egg laid today, so I want to make sure I up my girls calcium for the next 2 days by giving them Tums (500 mg extra strength). I know oyster shell is best, but my debit card is at it's weekly maximum for withdrawals and I lost track after paying bills and didn't have cash on me when it maxxed for the week...so I'm left without any money flow until Friday, which means I can't just "go and buy oyster shell" until then (thank God I buy my gas and groceries weekly or I'd really be out of luck!). UGH!!!!! So, back to what I was saying...I have Tums in hand...but didn't know if there was a ratio to provide? I have 6 hens, no roos...so, do I just crush up a few tabs and give them it or what?