Forgot to reply to don.ald about that. Tried a lettuce nudi a while ago. It did an awesome job of getting rid of the algae, or so I thought. When it ran out of Bryopsis to eat it withered away and disappeared, pressumably died. It lived for about 3 weeks. Once it was gone. The algae just came back in the same spots, I assume they leave little bits of the base behind which will regrow.
The same goes for other nudis I assume, Berghias, Monti eating ones etc... no more food, they die...
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