HoB Refugium care/filtration

[ashiWaza]

Recently set up a CPR Aquafuge 2 HoB Refugium on my tank. Anyone have experience in growing chaeto with it? Already using a different light with a more pink/red light spectrum I've seen posted here often. My main concern is the filtration. The chaeto doesn't seem to "tumble" in the fuge, should I add a small powerhead?

Also, in the future, should I just allow the fuge to get "dirty?" I'll add a small cuc once it matures a bit, but I'm assuming the idea is to allow it to get dirty instead of the display.

 

[Spare time]

You can just flip the chaeto rather than putting powerhead in. And no, do not let it get dirty. Dirty refugiums are such a mess to deal with and trim