Sometimes it is hard to tell which species females may belong to, so we don't make a habit of it. Similar young males may also fight if they have females to court.
OTOH, I have kept several species together in a thickly-planted tank with little dissention. I used to have a 20G tank that got all my older single, widowed killifish and they made a rather pretty display. There were males and females of at least 5 or 6 species at any one time, and they got along very well.
On the basis of that experience, I'd say go for it, as long as you don't try to pull females from that tank for future breeding if some are of similar species or different collection locations of the same species. Also don't let any babies that appear in that tank get back out into the hobby.
Much of the reason we use species tanks is the danger of hybrids when we have almost 800 known killifish species, many looking much alike. Hybrids introduce infertility and most of the features erroneously attributed to "inbreeding."
Wright
01 760 872-3995
805 Valley West Circle
Bishop, CA 93514 USA
Bookmarks