Man I'll tell you like I do everyone else. Check out the grow boss on YouTube. The man is a growing genius!
I spent 30 sec watching one of his videos and found 2 false info then stopped. I'm sure he knows a lot about growing but honestly even people with a lot of knowledge can pass on bad info. Personally I feel a forum is a far better source of info because it allows room for debate. The best tip for any grower is to question every bit of info and if they can't explain why then don't take the advice until you can find out the why yourself.
He says o2 drastically changes the ph... Absolutely false.
He says circulation in RDWC of 4x a day you don't need airstones... Now I personally prefer 10x site volume per hr. But 4x per will work.
4x per day??? No idea where he came up with that info.
Say a 40gal system would essentially need a 6gph pump... I don't think so.
Added: I just looked again he was speaking flood and drain so forget what I said about. Leaving that info cause I was wrong.
Video here.