Inverts and Calcium relationship ...

Question for all you guys. I added a Blood shrimp about 2 weeks ago. The water I use for top off has a high calcium content (lucky me huh). Anyway, the shrimp molted 2 days after I added him, then today he molted again.
Is this bad for him growing this fast ... or is it normal ?
Also, my blue legs, scarlet reef and zebra crabs are also growing quite quick as well. The emerald crab just molted Christmas Eve (he had been there for 2 weeks also).
Thanks for any info
 
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