Ok quick question, I have a total of 4 mystery snails. Two are in my 29 gallon community tank and the other 2 are currently in a 1 gallon. The 1 gallon is a bit too small, but to compensate I'm doing a 50% WC every other day. I read that Cuttle Bone for birds was a good additive for making their shells stay strong and healthy. So this morning before I left work, I picked up some. Its .5 oz (14g) and consists of between 31 and 36% calcium. I need to know the best way to add it to the water and how much I should add at a time. Also will the calcium be taken out of the water faster in the 29 gallon because of the charcoal in my filter? Any advice or suggestions is greatly appreciated. Thanks in advance. Peace 
