I am planning to start growing using hydroponics. Unfortunately I'm unable to obtain fertilizers that are made specifically for hydroponics. However, I can get water-soluble fertilizers. The images of the fertilizers are attached. The one named Libro contains NPK + iron, and the one named Torofert contains Calcium, Nitrogen, Magnesium and Boron.
As you can see, the NPK formula is 20-20-20, while the calcium is 24% in the fertilizer named Torofert. Torofert also contains Nitrogen, which is 15%. I'm also going to add Epsom salt (contains Magnesium and Sulfur) to these two fertilizers.
Normally, people mix three fertilizers: first one contains NPK with a ratio of 4-18-38, second one contains calcium and nitrogen at a ratio of 15.5% Nitrogen and 19% calcium (no magnesium), and third one (Epsom salt) contains magnesium and sulfur.
Do you think the fertilizer mixes that I have are suitable for hydroponics? Will there be too much Nitrogen or Magnesium since each one of them is included in 2 of the 3 fertilizers? Do I need to consider anything else?