Stonerdanswered grow question 3 years ago I actually believe that this is a Calcium (Ca) toxicity, usually with just Potassium (K) deficiency older and middle leaves turn pale green before suffering chlorosis and blotches, in your case top and middle foliage is dark green.
Calcium toxicity also inhibits Potassium uptake among other nutrients but since it's a mobile macro-nutrient it shows signs first.
Stop using all Calcium additives and monitor the plant daily for any improvement, your "MaxiBloom" fertilizer already has enough Calcium in it for your plants.
Don't forget to balance pH at correct levels (5.5-6.5) and water with runoff!
Hope this helps! Good luck and happy growing :)