Request for help in new refuge set-up

[mark]

I've got a 27W PC on my separate 20g fuge, grows chaeto great. For macro mostly it's Chaeto though have some Halimeda and grape caulerpa.

Observation from mine, I run ~200 gph straight from the BB display to it with no pre-filtering. As the fuge is just LR no sand I can see lots of detritus settling that I need to siphon out. I was going to put in a sand bed for pods (zero NO3 so DSB not needed for that) but after seeing the amount of crud, think I won't unless I run the raw water through a filter sock first.