I'd read you flood 4 times for 15 min during each light cycle, But that is just what I read. I plan to do Ebb&flow in the future but using soil my first couple grows.

As for roots coming out of the net pot. That is normal. Only issue you really need to watch for is the roots clogging the pipe. I wouldn't put any hydroton down there though. If they are really long and are close to clogging the pipe. (I've read somewhere) You could trim the roots. I'd wait for advise from someone who's done that though. :thumbsup: