That’s your problem right there I’m guessing! Cut it out totally and see how they respond! In a SIP container u don’t need near the nutrients as u do in a fabric pit for example! I usually can go an entire grow starting with soil with food in it and topdressing craft blend going into flower! U can topwater in some flower teas for some extra goodies but u def don’t need to feed em a liquid drench of nutrients every watering! If anything I would topwater in the MC once a week and then fill the reservoir afterwards with just plain old water! Betting they’ll bounce back for u quickly! Tough cuz some toxicity issues look like deficiency issues so have u chasing stuff adding food when they are really already full and not needing anything!