First grow

Over the last few days the larger of the 2 plants has gone from completely healthy to a severe case of nutrient burn. Both plants up until now have been treated the exact same. Same nutrients, same water ph. Started flushing every 2 days at the beginning of the week. I hope it will make a full recovery in the next week or 2. Nothing to do but wait at this point. p.s. the pictures are 4 days apart.