at least a 125gallon
they get up to 1', and you should get a few others with it, 3archers would be nice, they get pretty active in a school also.
but they are not fast growers.
oh yeah, i forgot to mention, they are one of the largest of the brackish fish species.
even though they are large, they are peaceful and are generally easy to keep.
ideal tankmates can include, puffers, scats, monos, and other brackish fish.the temeperature of the tank sould be around 68-82F
ph 7.0-8.0.,
and the kh is 9-19.
they are omnivores and will eat live insects, mealworms, freeze dried plankton. you should also add seaweed to supplement this diet.
Also, it is ideal to keep the water level of the aquarium a few inches below the top giving them room to practice their hunting!