you guys need to keep your batfish straight.
Pinniatus bats are the solid black fish w/ a red/orange outline as juveniles. These fish do very poorly in the home aqurium, very low survial as we really don't know what they eat. They will feed on live brine and mysids, but for some reason these fish just croak. That said a few people have had success w/ these fish abd adult pinniautus are a drag grey, ugly fish.
The other batfish common in the hobby are tierra bats and orby bats, these are brown, white fish, and do very well they eat like pigs and grow quite large. You really want taller tank w/ these fish as they get vertical size . These batsfish are recommended if you liek that sort of thing
frank