My guess would be youve got some salt build up going causing some toxicities and locking out some others causing deficiencies. It appears that you have some N Tox going on judging by the dark green and glossy leaves, that can lock out calcium which it appears to have a deficiency of also. Id flush real well, maybe with a salt clearing product like floraKleen, then give just pH'd water or very light feeds the first couple waterings afterwards. Good Luck!