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cowfish

Psycho-ologist
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Not a filter feeder. Possibly Hypselodoris bullocki .

Nudibranch tend to feed on one specific type of item (not just any sponge, but species of sponge) and generally starve to death in home aquaria as it's next to impossible to provide them with the needed diet.
 

guarda

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Oh wow. Gonna return mine then. i have the chromodoris quadricolor for about 2 months and was told it was a filter feeder at the lfs. Made sense at the time when I saw the 6 nodes sticking out of its back. So much so that I didn't bother to research. I should have known better.
 

Boomer

Bomb Technician (EOD)
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Made sense at the time when I saw the 6 nodes sticking out of its back.

Those are gills :) They are called Branchial Plume's. The name Nudibrach means "naked/nude-gills".The horn like structures on the head are called Rhinophores, meaning "nose-bearing" and are for smelling.

You have either a Hypselodoris bullocki or Hypselodoris apolegma and looks more like the later.
 
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Boomer

Bomb Technician (EOD)
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All nudibranches are predatory animals and some are very specific to what they eat, even the species. Yours > have only been found feeding on a blue-purple dysideid sponge of the genus Euryspongia.
 

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