An amazing product I never used until I was on RIU, Greensand, its an amazingly unique product, has all the micro stuff in it. Egg shells can be used for calcium too, but its real cumbersome, you cant really know if any disolved in your water, and they pretty alkeline. Home Depot also caries a product called Ironite, it has lots of micros, that what its for, including 12% calcium. So try to get micros in there and make sure ph is straight, flowering should go on without a hitch, carefull with that 20/20/20 its strong stuff, less is more I always say.
Sorry took so long btw, was a busy boy yesterday.