thanx for the info , in my grom room i run clay balls and feed every 3 hours for 15 min ,i was going to feed my clones on some half strenght canna veg a and b ,that a normaly use , because its the fist time ive cloned with rockwool cubes , the small ones , can you wett them twice a day like i was plannig to do or will i get root rot , until they are big enough to go in my grow room, rock cube in a 15cm pot surrounded by clay balls thanx for the help . cheers