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You'll know its rooted well when you get runners off the plantlets. If the cories dig any of it up, just keep replanting.
I battle with kuhlii loaches every time I replant carpet, and considered giving up on my first attempt with glosso. Let me quote some of the best advice I've ever gotten from Travis: "You have to be more stubborn than your fish."
FWIW, I have cories in a 10g newly planted with elatine triandra, a plant that roots about as well as glosso, and the cories haven't dug it up. Its been about two weeks.