Can you (defrost in Luke warn water and rinse) any frozen blood worms, glassworms or brine shrimp? Feed sparingly until they accept them. Make sure everything is cleaned up; that stuff rotting can really foul a tank. (Got a gravel vac?) Maybe drop items in a filter outflow.
Of course live foods such as black worms, small red worms, brine shrimp, Daphnia - whatever live foods they can swallow - are even better. Put the blackworms in large soap-less pickle jars where the killies can get at the worms but the worms can not climb the glass.
They can be robust feeders and need spacious quarters and faithful partial water changes. Hard, even brackish water is needed. These are not your typical rainforest killies. ;)
A friend has a pair shoehorned into a planted 10-gallon tank and offers them feeder guppies. The female F. heteroclitus jumped into the adjacent guppy tank and cleaned house. When they were that well fed, young mummichogs began appearing in the parent's tank and at a certain size, they were moved to their own 20-gallon with power filter. The mummichogs delineated between feeder guppies and their fry.
Just for variety, when they are eating well, save a couple unbuttered cooked peas from dinner. Shell the peas, break the halves to size and drop fragments in one at a time. A number of native hardwater killies will take a few peas.
Good luck and all the best!
Scott
Thorncreek drainage, flowing into the Calumet River and into Lake Michigan
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