Hello Eventhorizon
Have you checked the PH of the water?that could be given you the yellow leafs.dont use that tomate food it dosent have all the micros& trace elements a good 3 part nurts feeding formula dose.You may have too get some cal-mag plus for the water.Test the TDS ppm and the PH so you know
what kind of water you are useing.Let me know how thinks are doing.