Roots growing out of the drainage holes

hello fellow stoners, i have a problem could someone help please. I have my plants set up in a wilma drip and feed hydroponic system with a 600w hps light. The plants are 2 1/2 weeks old (cherry bomb) and are looking great and are very bushy. I have a problem though when i was checking them i noticed roots have started growing out of the drainage holes in the bottom of the pots. A couple of the plants roots have a tiny bit of brown on the bottom. The roots are exposed to light the way they are and i am worried that the rot could spread and the roots may get damaged being out of the pot. does anyone have a solution to this ??
Thanks for reading and hopefuly for responding Saul.

re pot them in bigger pots

the medium they are in is expanded clay pebbles are you still able to repot them ?

sure jus cut the bottom off of current pots and stick them in bigger pots u b good togo

kk i never thought of that lol. thanks for your help ill give that a try.