can you cut the roots?

they are first in rockwool, and then in a 2 gallon container with clay pellets. Theres 3 holes in the bottom for drainage and they are starting to come out of those holes. my fear is that i cant move them now, if i take them out of the pots id basically have to rip the roots out of the clay pellets...dont want to do that. So, i think im stuck with the pots i originally put them in. But definitly worried about cutting the roots.
 
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