hey man, the hydro babies should not have been nuted yet, get those cubes covered bu the hydroton, Im assuming you have water and a air stone in that tub, if you do keep the water right at the bottom of the net cups, do that and change water to just distelled right now and you wont reconize them in a week, then start the nutes 25%. that bubbler should grow them real well, even with all the duct tape...
good luck buddy