Do you have live plants in that tank? If not, I'd recommend getting some right away, or even a moss ball. You need something that will provide microorganisms for the fry to feed on. At their size, they are too small for regular fry foods and will need infusoria.
Another way you can provide infusoria is by filling a jar with tank water and then putting lettuce, clean grass clippings, dead hardwood leaves etc. in there. Let it sit for a day in room temp, then open it. If the jar smells like fresh cut grass and you can see a cloud moving around, you have infusoria. Pour about a quarter cup of this into your tank 2 times a day for the babies to feed on.
I wish my WCMM would breed.