Bamboo Shrimp?

How about bamboo shrimp (Atyopsis moluccensis) with discus? They look like little lobsters except they are filter feeders. Instead of pincers they have fan-like filament thingies that they use to strain food particles out of the water. Then they slurp the food off of the filaments and repeat the process. Since they have no weapons they are totally harmless to fish. I've seen them in action in a lfs and they are really interesting. I think they can handle temps up to 84 F and are not choosy about pH. For someone (Marie) who's looking for something in the lobster/crustacean family, they might work.

Had two, both goners in about a week. I think they need lower temps.

If I remember reading correctly I think they need a really good planted tank because they eat the algae flooding in the water.