i just went threw my book, a did read from Edd Rosenthal says hydro ph should be kept between 6.1-6.3 and soil should be kept around 5.9-6.4. keep rockwool ph at the lower end of the recommended measure to counteract RW stong alkalinity.

now jorge cervantes says in his book that hydro should be 5.8-6.0 and soil 6.5-7.
i alwas wonderd witch author was better, they both say total differnt things in each book. i tend to like edd more IMHO.
this is why i posted my notes to get things cleard up for me and to get some advice on things.