Like i said im a bit new to hydro but what does topping mean as well as rezing im guessing rezzing means completely changing out the water. Topping im also guessing means when water runs low you fill it back up to a stable level:confused in the bucket if i am wrong please let me know. Also what is a good scheduale to completely change the water of of the bucket. one more questions (by the way sorry for all the noob questions im just trying to get this down right) what is RO water. I will also be growing these plants from seed what should i start them in after germinating would rockwool be good i know usually people start from 2" rockwool cubes then transfer them in 4" till roots show them place them in bucket if this is right or wrong pls let me know.