Hi
mychl717 and Welcome to FishLore
Well you've got about 16" of fish space to 'play' with (using 1½" as the Neons adult size as that's what most people use

) so with that many Neons, you could go with an Amazon styled theme with possibly the following:
4 Oto's @ 2" (the preferance is 6 of them but 4 will work)
[8"]
Male and Female Dwarf Ram cichlid - German Blue or Bolivian @ 3" each
[6"] 14" Total
OR
1 Male Dwarf Ram Cichlid @ 3"
3 Female Dwarf Ram Cichlid @ 3" each
[9"]
1 Pleco @ 4 - 6" (Gold Nugget - 6"; Candy Stripe - 4")
15" Total with a 6" Pleco (if you got a smaleer Pleco, you could have an extra female Ram
Of course that would rule out the Guppies but the Neons could nip their flowing finnage anyways.
Just my
