If you already have a blue ram in the tank, you might want to rehome it before you put any puffers in there. Even if you get a super tiny dwarf(pea) puffer they will attack it till its dead.
You could get 1 redeye for a tank that size not multiple. Or you could do 4-5 Dwarfs
if you want tankmates for the dwarf puffers, here are my suggestions:
otocinclus
bumblebee gobies
kuhli loach
stone catfish
they are all in my 50g tank without any agression from each other.
i've noticed that dwarf puffers aren't agressive with fish that are bottom dwellers.