chaeto wont grow

[gobytron]

is that light an led?

I think your problem might be, as you have already diagnosed, flow.

My chaeto did not grow well until I doubled the flow going through my fuge...

[Lance]

Hey guys, if your nutrient level is so low that you can't grow chaeto why bother. You're growing the macro-algae to reduce nutrients, of which you don't have much. Sounds like a problem I wish I had.