I have 2 dusters & sometimes they will be closed for quite some time, being filter feeders they don't like it if detris has been stired up so that there are large particles floating about....
I add a little kent Zoe to my tank twice a week mainly for my inverts, but I was told (rightly/wrongly) that the feathers like it as well?
30gal tank, 20kgs Fiji + 4kgs Madagascan LR, bare bottom, 2 x Maxijets 900, AquaC Remora skimmer, 10W D&D UV using a spraybar on surface for return,Maxijet 600 + spraybar behind LR, Ecco 2234 running RowaPhos/GAC, 150w visitherm.
Custom Built lid; 2 x T5 megatwin (4x39W Aquablue+); 4 moonlights.
IKS with temp & PH probes, controlling lights,heat & cooling fans.
Percula Clown; Banggai Cardinal; Firefish; Mandarin
2 Cleaner Shrimps; 3 Peppermint Shrimps; 1 Blood Shrimp
1 Large Feather Duster; 1 Hard Tube Coco Worm; Yellow Cucumber.
6 Red Legged Hermits; 1 Green Emerald Crab; 16 Dwarf Blue Leg Hermits; 3 Zebra Hermits; 3 Popsock Hermits
22 Turbo/Astrae Snails; 20 IO Snails