03-18-2008, 05:56 PM
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Check your water quality first and foremost.... then add more shells of different sizes, all larger than the crab and his last shell.
What kind of crab is it? What else is in the tank?
Once we know better what's going on in the tank, we'll be better able to help you. When you test water, we'll need to know ammonia, nitrite, nitrate, pH, and calcium levels. Please don't use the strip tests, they are very inaccurate and won't tell us anything useful. Liquid kits are the best. If you need to take water to the LFS, ask them to please write down what kind of kits they used and exact numbers for the results. Not all stores will do this unless you ask for it, and "its fine" is not an acceptable or useful answer. "Just fine" actually tells us nothing.