20 gal tank suggestion?

[nono]

Hi. I could use some suggestion from you guys. I have a 60 cm x 40 cm x 35 cm tank and already running for 2 weeks. The water ph is always around 7.7 or 7.8. I am confuse of what fish should i add that is able to live until it hit max size in my tank. Should i add one channa bleheri and one channa andrao or should i keep maybe like 6 malawi cichlid that are mbuna type cichlid. Or should i just keep schooling fish like tetra or rainbow? Thanks

 

[xDestro]

Shell dwellers?
Shrimp
I would maybe do pygmy corys and something like white clouds or other small schooling fish
Apistos

 

[nono]

Corys? Never think about it. But how about single channa andrao or single channa bleheri?