IMHO, too little light of the wrong color and maybe too much water. Do you have a water meter? For Veg you want 6500k. 26w (I believe this light is 1600 lumens) is way too little. I would veg 1 plant with 4 26w 6500k. I am currently vegging 5 with 10 26w 6500K and 5 18w "grow floros." The setup works great for veg.
Wait for some of the more senior members to reply though. Let us see what they have to say.