I did have one once, and it seemed to do a good job cleaning up the pest algae all over our liverock, but it disappeared after not too long. I'm sure it died, but I wasn't 100% sure why, probably starvation. That's the last time I'm going to keep a nudibranch. Most are too specialized to be properly kept, although I see the lettuce nudibranch regularly.
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Current setups: 1800 gallon koi pond, 10 gallon planted, 150 gallon reef, other FOWLR tanks
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