I have a 10 gallon Aquarium with 2 Zebra Danios and 2 Glowlight Tetras. What other good fish could I add...?

Question

That would be compatible with both also, how many. The Danios are 1.5" and 2" and the Tetras are 1"-2".

Answer 1

You shouldn't be getting any more fish until you fix what you've got now.  Both species you listed require schools (5+ of the same species) to alleviate stress, and without them, you'll see them picking at each other and probably hiding a lot.  Get 3-4 more of each, and then consider a Dwarf Gourami or some (3-4) Cory Cats or Kuhli Loaches.

Answer 2

Albe to get only one or two more, but lots of fish are compatible. Angelfish, Barbs, Bettas, Cory Cats, other Danios, Gouramis, Guppies, Loaches, Mollies, Platies, Rainbow Fish, Sharks, Swordtails, other Tetras, the list goes on...

Answer 3

The rule is 1 inch of full grown fish per gallon. I would just get 3 more danios or glo tetras because they are schooling fish. They need 5+ in a group. You would have to stick with either danios or glo-tetras because you only have enough room in your tank for one school of fish. If you want a variety of fish, then I would suggest getting rid of your fish now and getting a couple mollies, guppies, gouramis, or platys.