there’s a little perlite in it, it’s a mix from my vegetable garden last year.. but i’m moving these guys outdoors in about 3 weeks and using fox farm for the rest of the grow.. first outdoor grow with 10 GG OGsI wouldn't worry about it too much. Some of mine do that and they grow out of it. Plant looks healthy otherwise. You could use a little perlite in that soil it's in though.
Totally natural, no problem.all other plants are fine and growing well, this ones stem is just red and i’m curious to know why.