I run 110gph for 4 plants under drip. I follow Zandor's method of lights on-flow on full (a stream) light's off 15m's on 30m's off...Thisn is what I got from Z awhile back...I think I saw where he mentioned 15 on 60 off...perhaps he has changed due to his newer system...later.peace.lw

I don't know if 2-4gph would cut it/last very long...perhaps someone else has an idea