I have some small L. Williamsii and Trich. sp. that were started in Jan. in plastic cups with bags around them. Acclimatizing them to the indoors now, soon to be on a windowsill.

I would like to re-pot the little guys into a small clay pot(s).

Should I keep them undisturbed in their current medium that's pretty much a pre-bagged mix or go to Al's gritty mix now rather than later?

They're still very small - maybe 1/3 to 1/2 the diameter of a dime, both species are starting to develop their 'spikes'.