I agree with Jianyang that "dither" fish can help get them in the mood by creating a feeding frenzy. I like Het. formosa or Endler's Livebearers for that. Less likely to nip fin tips than some guppies.
In my experience, the key factor is taste. Most LFS products are just not very tasty to killies, but high-grade Brine Shrimp Flakes from places like www.brineshrimpdirect.com are eagerly taken once they get a first taste.
www.kensfish.com is another mail-order source of real quality foods, some that killies really like. I think Ken lives near and is a friend of Dr. Terceira, so knows quite a lot about feeding killies.
I have even used Hikari small pellets (Oranda Gold) in a hand pepper mill to feed quite small babies. They eagerly attacked the floating "dust" particles.
Try different brands and see what they like.
It is hard to get enough dry food into killies (without fouling the tank) to put them into real breeding condition, so I still feed mostly live foods, with a supplement of flake pretty much when I feel like it. Mosquito larvae and blackworms (Tubifex, where available) are much more certain to produce lots of eggs, I think.
For just keeping pretty fish, I think flake food can be OK. It can produce full color, too, and it can add the variety that assures trace elements are not missed.
Wright
01 760 872-3995
805 Valley West Circle
Bishop, CA 93514 USA
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