How is your ph changing, is it going up, down, staying the same?

Also, take a bright flashlight and hold it up against your reservoir and what your plants are contained in. Do you see any light coming through that way? If so, that light going through could be causing algae to grow on your roots and inside your reservoir/buckets which is A HUUUGE problem. Might explain why it started when you just added the nutes to it.