Live foods, baby guppies, brine shrimp. I just rescued one from a stupid LFS that was trying to feed it flake. Poor thing was starving!!!
http://www.aqualandpetsplus.com/Oddball, Butterfly Goby or Wasp Fishl.htm
I prefer not to use the term butterfly goby, since there is a SW fish that is also called this (and is REALLY a goby) But then, waspfish is a bit too general, huh? Ive also seen Nandus nandus synonomous with V. depressifrons in some readings, but Im not sure that is true.
icthy- The site I linked shows vespicula and you have neovespicula. Odd eh?