Clare; thanks for the references.
Ghost shrimps are little terrors IME. If you're looking for invertebrates that will help with algae (particularly thread algae), consider amano shrimps. I have 3 in both my nanos and they're great. They're pretty hardy as well.
I wasn't looking for anything to get rid of algae, at the time. i just needed a relatively cheep tester fish/shrimp that would keep me occupied until football season was over. Alas, I don't have anywhere to put them after that.