I'm partial to the blue-eyed fork tail -
pseudomugil furcatus - because I have some ♡ I was also looking at the peacock gudgeons as I read they inhabit the same native habitat. That's all I know about them, not anything else like group requirements, etc. So maybe check those out.
Endlers? but do you want live bearers?
Also, I think I read that CPDs like slow current and high oxygenation. So when I got mine I made sure there were areas if both. They are known to be shy (initially I had 7), and they were shy and slower moving...
but
@seangee has a LOT more , maybe ask him to post the video he has?
And frogbit
The fork tail are not shy at all!.
One other thing, what is your water temperature, that may make a difference in your choice.?