Whats your water temps been at? Did you change the water or anything? Water should be on the warm side i think like 72-78, somewhere in between there. I lack a heating pad so mine take about 2 weeks a lil longer on the ones now, had 2 root in under 2 weeks the other 2 are still working on it.

Remember room temps do not vouche for water temps.....you need to check that out.