Only Magnesium or Magnesium and Calcium together?

I'm confused. Please help.

If I'm seeing Magnesium deficiency in coco with rainwater, should I add calcium and magnesium together or only magnesium? I have Canna Magnesium Sulfate (liquid epsom salts) and Canna Calcium

It says on magnesium bottle that ''Liquid epsom salts in concentrated form cannot be mixed with fertilisers containing calcium.''

Why do people add calcium and magnesium together? Everyone's talking about calmag.

Calmag is calcium and magnesium already together in one bottle, right?

How should I use my Canna magnesium and calcium? I'm not interested in another products.

I want to know how should I be using mine. Can I just mix them into my nute soup or not?

I guess it says not to mix magnesium sulfate with a fertiliser containing calcium, but that doesn't mean I could not mix it into a nutrient solution which contains a fertiliser that contains calcium, right?

I think it should be fine when mixing it into a nutrition solution!

What you think?

If my plants are magnesium deficient in veg I would foliage feed them and I would add some Epsom salts to my nutrient solution, if in flower skip spraying that can lead to mold. You can add both Epsom salt and Calcium to your nutrient solution that is not a concentrated form. Some people do premix concentrates and for some things you need two or even three part solutions to keep certain nutrients apart. Acids, Basics and micro elements such as Iron and Zinc. Again all these things are fine to mix into your solution at the recommended dosage this is not a concentrate it's a nutrient solution with very low dissolved solids, definitely not a concentrate with a high amount of dissolved solids. For example you might mix up a bottle of 100:1 Calcium and a bottle of 100:1 Magnesium Sulfate in opaque bottles or jars so you can easily add that to your reservoir by eye dropper. In that case you keep them separate and add 100 times the recommend dosage into purified water. That's a concentrate.