look on label of "garden lime" to see if it has any listing for magnesium
you need to add more agricultural lime because it breaks down slower than hydrated lime will
and sorry almost forgot to tell you what to do instead of what not to do
how do you check your ph(for starters)?
read the garden lime bag for application rates depending on potency and mix then test after watering a couple of times
only use proper ph water and wait till it evens out upon testing
putting plants in soil you know is out of balance will only cause you worse stunting and plant defencies to fix in a crucial time for development
one thing i would recommend when using smaller containers is wattering less but a couple of times giving them a less of a swing in extremmes
to be clear on feeding days if you gave them a cup of nutrient mix solution then spread it out to atleast half twice a day but if you were constantly watching change in ph for exmp[le you could add little by little as the soil needed it to be optimum moisture level ie. drip irrigation, flooding, to name a few whatever you choose the trick to everything is not overwattering
overwattering will lead to other issues as well and microbe damage nutrient lock to name a quick few
lots more gotta run for now but this will get you started