Emerald crab and Lettuce sea slug

[LittleFishiez]

If I had an emerald crab and a lettuce sea slug in the same 10 gallon tank would there be any conflict?

[Sniperhank]

Yeah, there simply won't be enough food for both and the lettuce nudibranch will die of starvation. They need fields of hair algae simply to survive and a 10 won't provide enough.