This is what my chaeto refugium looks like... keep in mind this is in my sump but yours will be the same idea:
I have a couple pieces of live rock in the bottom for my copepod population, but it’s almost entirely chaeto. I don’t harvest it as often as I should...
I have a couple pieces of live rock in the bottom for my copepod population, but it’s almost entirely chaeto. I don’t harvest it as often as I should...

.... some fish like dragonets only eat copepods, so you need a good deal of live rock (aka a pretty big tank/fuge) and a thriving pod population to keep one.

