Lyretail Or Blue Lyretail (Gardneri) Killi?

[Jase82]

Hey guys, I seem to have narrowed down possible Killis for my 29 gallon community tank to two species.

Lyretail or Blue Lyretail (Gardneri) Killi?

What species would work best in my tank (seen below in my sig). Temp will be 78

*Also, how many males could I keep?

Thanks =)