This fish, species is Epalzeorhynchos frenatus, attains six inches (15 cm) and is recommended for a 4-foot (120 cm) length tank minimum. While it might manage in a 3-foot, it does severely limit other fish as tankmates, and this is more difficult to get arouond in smaller as opposed to larger tanks. I realize a foot (30 cm) may not seem like much of a difference, but to the fish it is quite a difference. The following may be of interest.
Compatibility/Temperament: Territorial and combative with its own species; best kept in solitude (as they seem to live in their habitat). Young fish tend to be secretive, but as they mature some can become aggressive, especially with their own or similar species. This "shark" will get along with some of the loaches (Botia sp.) in largish tanks, but other bottom fish should be avoided. Upper fish such as the medium barbs, rasbora and danios would be suitable, depending upon the aquascape. In a large aquarium (6+ feet) a group of 6 could be attempted, but any fewer would likely result in the death of subordinate fish within the group.