Harlequin shrimp won’t touch serpents or brittles (I’ve kept them together.)As far as I know, bongos and harlequins will eat any type of echinoderm, though they prefer true Asteroidea. Anything with tube feet.
I have never kept them (starfish lover) so I cannot speak from experience.
Bongo shrimp eat exclusively micro brittles (they won’t touch asterinas and other starfish)
I don’t think bongos will eat large brittles/serpents as they can’t pin them down easily.
Harlequins are also rumored to eat sea urchins but I’ve never experienced that either, can’t say I’ve seen evidence of it at all, in fact I’ve seen more evidence of harlequin shrimp eating hake than sea urchins.
Bumblebee shrimp I’ve recorded eating starfish before, cucumbers not so sure but I wouldn’t be surprised since starfish apparently is an option to them.
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