Ive got one of those ez cloners or express cloner,or sumthing,the same idea,aeroponic style,im using rockwool in the net pots with cloning gel,now do i leave the pump on full time even with rockwool??
If it is the ez cloner, leave it on 24/7. Don't worry so much about the temp in the rez as long as your ambient temps are good and you use a product similar to aquashield/hydrogaurd. And, make sure you put the air stone in there. Some say you don't need the air stone. They will still root if you don't, but they won't look as pretty.
I ran an ez-clone on a timer and it cost me a pump. The instructions say leave it on, so leave it on.