you are lacking more then just calcium and magnesium. somewhere in the these archives is the name of a product available from hydroponics suppliers that provides the lacking or low nutrients or you can get one step closer to what you need with the addition of composting earthworms such as E. hortensis (euro nightcrawlers), P. excavatus (malaysian blues), or E. fetida (red wigglers).
i prefer adding azomite or aggie lime over egg shells. but watching the egg shells dissolve in cider vinegar is fun.

i initially had to manually pollinate the Bhut Jolokias it is not hot enough in San Jose, CA to really have them do well outside of the green house. in fact just lost the last three plants in the aquaponics system to a freeze. unlike some other chiles i found they like their feet wet.