Glofish tetras are actually modified white skirt tetras. Glofish are “created” using an entirely different process than dyed fish, and there are no negative side effects or pain for the animal. Glofish tetras behave the same way as regular black skirt or white skirt tetras. They are generally peaceful and prefer at least 4 or 5 others of the same species of fish to socialize with. Depending on the size of your tank, you could add another two color variations of your Glofish tetras or add other types of glofish such as Glofish danios or even one Glofish shark (Glofish sharks are actually modified albino rainbow sharks which will fight with other rainbow sharks for territory. The only Glofish you may want to avoid because of aggressive behavior would be the barbs because they are actually modified albino tiger barbs which are known to be nippy and harass their tank mates. You can also look at any many other peaceful community tank fish such as glowlight tetras, cherry barbs, or livebearers such as guppies or platys.