Tiny "feather dusters" growing on zoa

[cly2012]

Are they something i should be worried about? The zoas dont really open much since last week.

[CFOh]

Try Google Syconoid sponges.. They r filter feeder.. Cheers..

[blusafe]

I have those ALL OVER my tank on EVERY SURFACE. Sump, overflow, pipes, rocks, etc etc. They are not harming your corals - something else is causing them to close. If they were irritating the zoas, then only the immediate polyps should be closed.

[diverxxx]

the feather dusters are not harming your corals, try checking your para

[ASHWIN]

I Have tons on My DSB..Haha..free small feather duster..when reefers come over!