You can set it for a trickle. Down to 1 percent even off. Definitely adjust to any variable speed.How low is the lowest setting on axis 20? When I got the hygger (395gph) a couple days ago I thought i would be able to adjust the speed down to 80gph-ish. The lowest setting it can go is around 118gph. It’s too high that the back chamber can’t keep up. I may have to look into this one. I already have the AI light so it’s nice that it uses the same app.