Plants showing signs of cal and mag deficiency.

Hi, just wondering what to do about my plants showing signs of cal and mag deficiency. I'm pretty sure it's classic signs, yelling leaves, spots, red stems. I watered them with calmag a few days ago but the problem is becoming worst. I followed the chart on the back for amount to use, should I have increased from what was suggested since the problem already existed? I'd appreciate any advice on the subject.

When i hear spotting on leaves I think spidermites.wont hurt to start treatment for them if your not allready

Hey thanks, I'll give them a squirt again

I did a little more research on deficiency, I'm pretty sure I made two mistakes. I over fertilized and got potassium deficiency, (rust spots) and my container size is too small. I believe this because is was my biggest plant that first showed signs...then others began to follow as they grew larger. I also noticed roots appearing on top of my soil. I think it's time I invest in a PH pen as well.