ImACoolguy
Aquarium Advice Addict
Imo, neon tetras need at least a 15 gallon. They get 1.5-1.8, too big for a 5, imo.
All schooling fish need a group of 6+, not 4.
While I think think their size is appropriate for this tank. I don't think they are suitable as they can be skittish and IMO need a larger group than 6 to make themselves at home.
Caleb