He is about 2 inches or so... This specific trigger is definately not a good choice if you want to experiment with different fish... unless you have multiple tanks and you can dedicate one big one to this one fish... Undulated triggers dont even get along with themselves very well. Niger triggers are cool, Huma Huma... Hawaiian Blacks are cool... But most triggers are very Iffy when it comes to involving other species. If you want a trigger do A LOT of research on your tankmates (you should for all fish but triggers can be tough tankmates) Good Luck