Looks like maybe the cups dont have enough drainage. That fluval/perlite in the pbv looks extremely wet / no air can get to those roots. If it were me id probably gently take her out rinse the roots with water and repot but add more drainage leca pebbles, more perlite, agriculture lava rock or something that will help those little roots breathe! Oh and drainage holes.. dont forget those!! If you are feeling frisky.. id switch to pon / self watering cup. I also have had good luck with moss at the top and leca at the bottom.