Large individuals will eat ornamental shrimps and tinyl fishes. -freshmarine.com
They will eat very small fishes, crustaceans and worms, but otherwise leave larger-than-mouth size organisms totally alone. Reciprocally, all but the meanest of fishes leave them be, letting “live and let live” with the Pholidichthys residing in their dug out caverns and caves.
A good-sized system (at least a hundred gallons for three specimens) with plenty of rock d?or that is, importantly, set right on the bottom in a secure manner. All heavy objects should be set in the tank first, and substrate placed after… to prevent toppling as this species is superb in its undermining activity (hence the name “engineer”). -wetwebmedia.com