I have my pump running 24/7 and i've never had any problems my cubes are always soakind just make sure you tek that white rapper of this aids in roots comeing through the sides of the cubes i've been doing this for a while now and always had good crop at at the end.I suppose if you wanted to you could put them on a timer to com on a few times aday.But i hear so many problems of mould in system mould on plants i'm sure that the constant movement of water helps to reduce any of this .Ther is no dought but you will hear 1000 and 1 answers why you should'nt do this but all i can say ismy plants love it i'm even thinking of doing a grow next year at side of a river i'm gonna get em has close has poss just incase water risers so i do'nt have to fuk about feeding just tek odd nutes i'm gonna use some slow release pellets and sea weed exstract and a littlt barbed wire to keep the rabbits at bay wish me luck I'm gonna be useing arjons ultr haze#1.With constant water running over rooys this strain reached 9foot in 5 week of flower.Don't worry your doing the right thing take some clones if your worried but you have no reason to be.Always keep a mother plant then you can experiment more.
