Not Another Build Thread!

I guess I can go buy some orange sponge for it to live on.

Good luck. If you actually happen to find a source for the exact type of orange sponge they eat (not sure the exact species of sponge) please post it so others can benefit. Again, never heard of anyone keeping them alive and they seem to always cause major problems in tanks when they die and release their ink/toxins into the water.

http://www.peteducation.com/article.cfm?c=16+2158+2219&aid=2145

The Purple Nudibranch is also known as Blue Dorid Nudibranch. It can be a light lavender to dark purple or magenta.
Unfortunately, the dietary requirements make survival of the Purple Nudibranch in the home reef aquarium very difficult. Most nudibranchs eat a specific species of sponge or bryozoans and will accept no substitutes. Because of this, only experts who have had considerable experience with and knowledge of Nudibranchs should attempt to maintain them.

Nudibranchs are a difficult to impossible specimen to keep in the home aquarium. Almost all are very specific in what they eat and when that food source is gone they perish from starvation. Common diets include sponges, sea squirts, polyps, soft corals, etc. but limited to just one food source. Sad to say, but this Nudibranch is probably doomed to die of starvation. Did I mention they are poisonous?
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Another major difficulty is that these snails are empowered with skin glands that produce potent poisons; some species make sulfuric acid, others non-acidic noxious substances. There are celebrated species that use the cnidocysts (stingingcells, nematocysts) they reprocess from eating stinging-celled animals. Others have spicules embedded in their mantle. With their sudden and mysterious death, this stuff ends up in your water.---WetWebMedia
 
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