RW-4 in a 20G

[intarsiabox]

I have a 20G long tank with LPS and softies in it. For flow and filtration I have 2 power filters running floss, carbon and chemiclean that put out a total of 300gph or 15X turn over rate. Everything seems happy and is growing but I'm concerned about just having a constant downward flow pattern permanently. I would like to add a mild random flow to the tank and was thinking about the Jebao RW-4 and running it on Else mode on it's lowest setting but I previously had a WP-25 on a 29g tank and it was just too much. Does anyone have any experience with the RW-4 on a small tank? I have a torch, elegance, frogspawn and long tentacle plate coral that I don't want to remain in a contracted state due to too much flow. Thanks!