I sowed some of those Nerine seeds from a recent seed distribution. They have germinated nicely and are coming along. I normally start all my seeds in single serving Yogurt cups from the various manufacturers therof. I drill several 3/16" holes in their (the cups) bottoms, and have had good success for many years. The Nerine seedlings have sent some roots through the holes in the bottom of the cups - much sooner than any other seedlings I've started. So, leave them be, and some roots will be snaking around in the saucer which the pots sit in, and will ineveitable be lost when I pot these seedlings on to larger containers. Or,..pot them up now, with root disturbance to very young seedlings, but with subsequent long roots not being lost? What do you all think?