ya man definitely not superthrive for a while. i dont like that shit too much because it always gives my plants a little nute burn on the tips. my seedlings are about a week old and i just spray them with ph'd water 5 or 6 times a day. soon their roots will be touching the water (DWC set up) so i wont have to water anymore. im gonna wait a good 3 weeks before i add any nutes at all. oh and rockwool sucks. you should get some coconut fiber plugs or something that doesnt hold as much water. ph fluctuation is more of a problem with rockwool. hope that helps