Hey Alex...
You should talk to Gary P. about these! I think he might have had pretty good success keeping them at one time or another.

I know (or have heard) they are not photosynthetic and are filter feeders (think phytoplankton drip). I am considering doing a species tank with a few in the near future. Maybe have them and a pair of purple firefish... pipe dream at the moment, but I am seriously considering it!

HTH.

Regards,
DAB