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Zoanthus sp. corals?
Phytoplankton should work. I spot feed my polyp corals with cyclop-eeze too, using a pipette, and turning off powerheads for 5 mins.
I dump in a little ESV every 5 days. The zoos will gather up what floats by them. They close up, eat, open back up, then grab some more if it floats by. They're doing just fine BTW.