Hate to tell you as you are already loosing 2 of your choices , but a dwarf wouldn't work in your tank either (Rec 70g) , I understand why you want one they are a pretty fish, maybe one day you'll upgrade to a bigger tank.
there are a lot of nice looking fish with tons of color that would work in your tank . and wouldn't break the bank , check the nano section at live aquara , there are a lot of really colorful fish in the nano category .
even though you need to swap a few fish out there are a lot more of fish that you can choose from.
Fish are like lifesavers
They come in different colors