Shagrathanswered grow question 4 years ago Hi there!
Did you wash and pre-soak those pellets in pH balanced water? Clay pebbles need to be soaked in 5.5-6.5 pH water before using 'cos they have more neutral pH and it will raise your rez pH too.
How often you measure pH? There is something going on but she will survive for sure. Seedlings are very fragile to everything and there is chance that even without doing anything she will grow out of whatever is bothering at this moment