i'm working on hatching brine shrimp right now, and i see him set up in a territory and defend it against guppy fry. perhaps he'll eat one.
on a sadder note. i lost my violet goby. he bloated, recovered a bit and finally lost the will to continue. don't know if it was from a bacterial blast from changing water with mismatched temp/salinity, or a bug the wasp fish was carrying, and i didnt quarrantine it long enuff. or maybe the wasp fish stung him?
i dont know. the mollies and the wasp and the bumblebee goby look just fine.
will have to do some water testing.