8 pot Wilma

[Church-The1st]

Hi everyone
i have recently bought a 8 pot wilma hydro system will 600w light with all the needed extra's.He also gave me a Large Bag Of Clay Pebbles?
Not to sure how to use these lol
ANY Help From you Pro's out there?

 

[mikeydean]

use these for you medium....no rockwool or other stuff