IME teas in coco are awesome. I throw a little guano, kelp, and mycro in there. Never happened to me, but if they are applied too frequently you can get a bit of a lockout from the excess of trace that is in the tea (not based on own personal experience, have heard it from legitimate source though and he is always in a soiless coco peat mix so it could be possible that it would not happen in straight coco)