I waited a bit too long with repotting.. They were all root bound.. The rhizotonic did its job for sure! I transplanted all of them in 25L pots on day 21 just before the lights went out.. I mixed universal potting soil with some coco and some leftover perlite.. Nice and airy for the roots to grow in.. The universal potting soil has some nutrients but not specifically for growing cannabis.. I'll see how they'll react and wait with adding extra nutrients until they really need it.. Only thing I'm adding is rhizotonic right now