29 Community Tank, what next!

[wmitchell96]

I have had a 29 gallon long for about a year now, and I don't know what to add next! It is not planted and currently it contains:

1 Angel (half dollar sized body)
2 Bolivians (added most recently, they are fairly aggressive towards each other, especially during feeding)
5 Sterbai Cory's
5 Neon Tetra's

The angel doesn't bother anyone, one bolivian is aggressive towards the angel, but once he leaves the bottom of the tank he doesn't pursue him. The other bolivian ignores the angel and just fights with the other ram. No one bothers the neons or the cory's.
I was wondering what I could add to the tank next! Any suggestions would be appreciated!

 

[josh7]

I wouldn't add a different species I would add more neons and Cory's up the neon tetra school to 10 and the Cory's to 8.