AsNoriuanswered grow question 2 years ago ph related, would not worry, soon you will transplant and if you will care about ph, no such mark will appear ...
overwatering, small calcium issue, name it as you want, no big deal, soon new house and all will be overgrown.
i see no signs of you measuring ph on diary, its one of most important things in grow and for soil its recommended to be 6.3-6.4