Are you doing anything in terms of fish, or is this strictly going to be a shrimp breeding tank?
Celebes rainbowfish are easy to find of course. A little harder, but still traded, are the various Celebes ricefish - I suppose the Japanese ricefish wouldn't be the worst stand-ins.
Probably the most interesting would be a halfbeak though. Cebeles halfbeaks are fairly easy to get in the hobby, and given they don't leave the surface much, my guess is they wouldn't hassle shrimplets much. They tend to like water a bit more acidic, but should do fine in the 7.5-8 range if properly acclimated.