I've never had clones root in 8 days, and not without high humidity and a heat mat... so either A) you've got pretty-green, dead, twigs in dirt, or B) they'll root in the solo cups. I've cloned into soil or pellets in soil like you - but, with a hum. dome and heat mat - and it has worked. So... I dunno, try to update us when you get roots coming out of the bottom of your solos. GL - maybe give them a foliar feed, as you didn't see roots yet.