What do you think I should add?

I have a 20 gallon high tank and I have:

~1 male betta

~1 female german blue ram

~1 female bristlenose pleco

I am thinking to add either:

~5 threadfin rainbowfish

~3 peppered corydoras catfish/5 panda corydoras catfish

~1 male german blue ram

OR

~5 black phantom tetras

~3 peppered corydoras catfish/5 panda corydoras catfish

~1 male german blue ram

What do you think, and do you have any other ideas?

What do you think I should add?virus protection

i would do the phanton tetras(6) and the female ram, and the peppered cories, rainbow fish are too large for such a small aquarium, are you planning in upgrading?

What do you think I should add?agv

i think the rainbowfish would be pretty in a shoal. the panda corys, and id get the ram. nice fish! i like all those 2!
Do the tetras one.
5 black phantom tetras

~3 peppered corydoras catfish/5 panda corydoras catfish

~1 male german blue ram

go for this selection!