IME with these little guys and what I have read, they really only like a few types of very fine macro algae. Or at least that is what the larger mature specimen I have kept seemed to really eat. If they cannot find it they will wander around until they find more or their death. I had an overwhelmingly good experience with my one lettuce slug even though mine suddenly disappeared from my main display. For months I just wrote it off as another MIA. But luckily I had a huge 120G caulerpa/macro sump and another 110G dutch refuge. When inspecting the fauna in the sump one day, I noticed small green things that were larger then most pods, but smaller then the mini shrimp I had in the sump. Upon closer inspection they were baby lettuce nudibranchs! hundreds of them. Sadly almost all of them died. I would imagine due to lack of a specific food. I remember reading later that the key to success was having a large thriving colony of halimeda in my dutch tank. Without knowing it the huge amount of perfectly good zooxanthella expelled by a healthy halimeda plants older parts dieing off and turing white is what helped seed the bodies of new born lettuce nudibranchs with cells for photosynthesis.
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