After a bit of searching, I find that the five line killifish are in fact Aphyosemion striatum; a rather easy water bunny type. They will swim throughout the tank, and are not surface type killies.
For surface type killies, consider some of the Epiplaty genus.
And, yes I know this is a very very old thread
take care,
wm_crash, the friendly hooligan
AKA #08840, SAA #162, SVAS #120, HOOLIGAN #1
Wilmington, DE