How big is your res?
Yea the simple basics are 1/4 nutes to start out with and slowly rise that to full strength nutes as you see your plant able to handle it. I would say by the forth node you should be able to use full strength.
Here is a good guide to go by as to what your ppm should be...
You should wait at least a week to add nutes or once the 2nd set of true leaves show. Just use ph balanced water until then and when you are ready to start the nutes do not add full strength nutes, add about 1/4th of what your normally would. Then up it a little bit at a time as they grow till...
I would germinate in the rock wool cubes and then transfer to your system. You could also just go ahead and germinate in the rock wool cubes with them in your system. Just don't have the feeder tubes running yet or you could run the risk of drowning them.
Re: My fault? need a stoner´s opinion
Puff, puff, pass is the rule around me and my friends. You don't hog a joint (bowl, bong or whip), it is against the stoner rule book. The roller or packer getting the first hits are normal. Sounds like you have a very rude and inconsiderate friend. Put him...
Good luck with your grow! There is always a lot of learning with the first grow. (I am in the middle of my first grow) I look forward to seeing your progression.
The one thing I would think is that you would want your temp to be about 65-70. I don't think the res water should get above the low...
Welcome! Good luck with the grow. There are a lot of people here with a lot of experience and we will all be ready to help if you have any questions. Will check back to see how its going.
The best way is to heat up the alcohol a little bit, take a zip lock bag and put your piece into it. Add a nice amount of salt and then add the heated alcohol to it. Shake.. shake... shake. Keep repeating till its clean, shouldn't take long at all. Good Luck!