Which tigerfish? Bear in mind that one of two common species,
Datnioides polota (=
D. quadrifasciatus) is a brackish water fish and is hardier and easier to keep in slightly brackish water. The Indonesian tigerfish
Datnioides microlepis is a freshwater species, while the New Guinea tigerfish,
Datnioides campbelli, is a brackish water species.
A single
Datnioides polota might be maintained in a 75 gallon system, but it's hardly ideal.
Datnioides microlepis and
Datnioides campbelli are much bigger and will need a much larger tank. "Getting rid" of a fish of this type isn't as easy as you might imagine, so it makes more sense to either plan to get a fish you can keep, or else choose another species that will fit into the tank you have.
You will need to think about feeding these fish. They don't need live feeder fish, and for reasons that have been explained repeatedly on this forum and elsewhere, you shouldn't be using store-bought feeder fish anyway. Earthworms and river shrimps are useful foods for settling in new animals, but once acclimated to the aquarium, they'll eat all sorts of wet-frozen and fresh foods. But do review thiaminase, and understand which foods contain it so that you can minimise their usage. It seems likely than many mysterious deaths of predatory fish come down to overuse of thiaminase-rich foods (prawns, shrimps, mussels, etc.). Unfortunately, tigerfish don't usually take pellet foods, though some do. Certainly try it out, because pellets provide the best balance of vitamins and minerals, but don't bank on the use of pellets.
Cheers, Neale
I think im going to get a tiger datnoid. When they get to big ill get rid of it.