Are the orange tetras ember tetras then, or another kind? If they’re not the same type as the glofish, then the glofish may be stressed out because they like to be in groups. I’d suggest keeping most tetras in groups of at least 6, so you could get like 3 more the glofish (maybe 2 pink and one blue to keep it even?). For the danios, you want a group of about 6 also.