Purple Nudibranch - Hypselodoris bullocki/apolegma

SKU: 242835
Manufacturer: That Fish Place
MPN: 1121-nudi

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Purple Sea Slugs (Hypselodoris bullocki and H. apolegma) are easy to spot with bright purple or fuchsia bodies adorned with an opaque white edge on the mantle and yellow to orange gills and rhinophores typically. Some variation to these colors may be observed from specimen to specimen.

These two species are very similar and have only recently been reclassified as two "sister species" rather than regional variations of H. bullocki. The primary difference is the white margin which is sharp on H. bullocki and diffuses into the base color on H. apolegma.

The term "nudibranch" means "naked gill" and refers to the fringy, tassel-like gills visible on many species. This group include animals that we commonly refer to as "sea slugs" as well as the sea hares popular for algae control. As a group, there is not much known about many species of nudibranch and more are being discovered and reclassified continuously. While some like the sea hares are well studied and we know enough about their life cycles and diets for them to be maintained, the diet and requirements of most nudibranchs is largely unknown. Most are thought to feed on sponges, polyps, tunicates. Some of the most colorful nudibranchs are actively collected and sold for aquariums but many more come as "hitchhikers" on rock and corals, for better or for worse.

Use caution when placing any nudibranch in your reef system if its diet is an unknown. Nudibranchs in aquariums are generally shortlived, both due to their natural short lifespans as well as the difficulty of meeting their dietary requirements.


That Fish Place
Common NamePurple Nudibranch
Scientific NameHypselodoris bullocki/apolegma
Reef SafeYes, with caution
Invert SafeYes, with caution
Community SafeYes
DifficultyModerate to High
Max Size (in inches)2
Min Tank Size (in gallons)55
Dietlargely unknown, possibly sponges
Specific Gravity Range1.022-1.026
pH Range8.0-8.4
Temperature Range75-82
ToxicYes, if stressed or eaten
Internal Id

State Restrictions
Armed Forces Americas
Armed Forces Europe
Armed Forces Pacific
Puerto Rico


Ratings & Reviews

2 reviews

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Too Bad :o(


Arrived nearly dead and only lasted a few hours. No guarantee on these. :o(

Customer Review


As cute and adorable as these little babies are, they only feed on a specific kind of sponge called Euryspongia which I've found it's not something you can buy anywhere at all. Alternatives have been tried but with no success, so if you buy it'd just be a nice sea slug to observe for a few days and maybe take a picture or two but not your long term buddy.
People have said they've seen them eat algae, that mans that are starving! and will not last long.