Without knowing all the variables of the grow it's guess work. Growing under strong LED light can require more cal and or mag than some are used to under other light sources and can be a learning curve if your used to something else,light bleaching is not a good thing. Too much of one thing or another can cause a lockout of something else,ph can cause lockouts. It may be a combo of things and figuring it out at this point could be tough. You may want to do a good flush then go back to a basic feed in case you had a build up of something that caused the lock out. Sometimes you can make it worse trying to solve it. If you have enough cloudy and amber you might want to cut early if it shows signs of getting worse quickly.