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I feed mine Phytiplankton , i bought it at my lfs for $8.99 , its expensive but it'll last ya for a while , feed the feather duster directly with a pipete or put a few drops ehere there is alot of water movement
I have phytoplankton, but honestly my dusters seem to filter feed the water column just fine without any additives.
Frankly, I'd suggest something like Cyclop-eeze ...it's bigger than phytoplankton, but my yellow polyps eat it like crazy, and so do my fish. I highly recommend it be included in your fish food pantry.
phytoplankton for my featherduster worms. and once a week, micro vert.
my phyto cultures keep crashing so im using phytoplex. its a good product but dont use too much if you dislike microalgae.
i like microalgae because the mullosks love it.