Suffice to say, caring for lettuce slugs poses in interesting conundrum. On the one hand, if you have a real problem with green algae, and you get the right variety of slug, it may actually rid you of your verdant pest. On the other, if you get the wrong kind, it will surely die. There is no way to tell for certain, unless the salesperson in your local fish store can assure you that the individual you are buying has been witnessed eating the algae your tank provides. For example, Bryopsis, Chlorodesmis, Codium, Derbesia, Halimeda, and Caulerpa genera algae are all listed as possible algal prey for lettuce slugs. Yet, a given individual may refuse all but one of theses offerings-sometimes only a single species of a single genus is accepted.
- Quality Marine (wholesaler)