Your mulch should not be right around the base of your Daylilies. They wind up being too deep after a few years and the mulch can hold too much moisture and cause rotting of the rhizome. Daylilies benefit from a spring feeding,and some also feed in fall.More than that is not neccessary.

Betsy

So, how far should I pull back the mulch? It is pretty hot here in the middle of the day, will this cause them to dry out more? Also, I would think the pulled back mulch would cause a " hole" around the base, is this bad. My soil drains pretty nice, but will stay moist. Or should I just keep it thin around the base, rahter than exposed soil?

Keep it thinner close to the base. The foliage should shade the root area. Make sure the mulch doesn't mat up. Keep it loose to allow water to penetrate easily and air to circulate. I always plant a little high and that insures that I will not have a depression around the plant to hold water.
Applying the fish emulsion is good I think. I wouldn't apply 10-10-10 without a soil test. If needed, I would just make sure the mulch is cultivated before broadcasting the fertilizer.
(And I think Betsy used the word rhizome when she meant crown. Most daylilies don't have rhizomes; only the old spreading, ditch lilies, tawny daylilies, tiger lilies or very close relatives)
Ed

Thanks,Ed.

Betsy