The only nutes I ever use in water is superthrive (and i dont always use it), along with a well balanced mixed flowering fert (but only when i transplant into the largest pot, a 5 gal container). From experience when I look at your plants they scream nutrient burn. You are lucky you didnt kill them. I would say water with water only, and if they start to get a little bigger start using a little superthrive. Remember that it is a weed and will grow off only using water.