Stocking Suggestions for 29 gallon

[SalviniCichlidFan]

Hey y'all.
I have a 29 gallon with an angelfish, a keyhole, a Bolivian ram, a honey gourami, and a clown pleco.
I'm thinking about adding another fish in.
What are your suggestions?

 

[Deadeye]

I wouldn’t add anything but a small schooler like a serpae tetra.