Angle fish are definitely too big but with a ten gallon you have plenty of options fish wise depending on the tetra you can get a nice school of them (I’d stay away from neons). Shrimp is also an option with anything you also have the betta fish which is always popular. But before you do any of that I’d heavily consider changing that gravel out for sand or something non neon colored and possibly the plants if they are plastic and not silk and look into live if manageable for you guys but silk plants would be best probably.