Eleotris likes to hunt either head facing down or head facing up in the plants, today facing down.
When it hunts in the Vallisneria, it adapts an entirely different color scheme.
I believe it'd eat whatever passed by, although the fish in the tank may be slightly too large to take in one bite, even with its gaping mouth.
Because the tank is outside, all kinds of critters end up falling in, and I like to stun everything from moths to beetles that pass by.
Its been about 6 months since the Eleotris was captured in a stream here, and it has finally learned to accept chunks of cut fish.
During the rainy season it became difficult to catch local shrimp, but it soon learned from watching the cichlids tearing up fish chunks what to wait for. It often steals the large chunks from them as the squabble over pieces too big for them the comfortably eat alone.
Penal status realized, and after 6 months incarcerated, and surmising (maybe) I am not an immediate threat, the Eleotris has become comfortable enough to venture from its hideouts more often, and wait for non-motile food, making clearer pics are getting less difficult to take.