m0useanswered grow question 2y ago There are better brands of nutrients that do not cost as much and are more well rounded in terms of a complete feed.
Jacks, Tera aquatia trio or nova lineup, all much cheaper and a better product.
Looks like some Magnesium or Iron can help your situation. If your growing in coir and did not buffer or wash your coir before hand I would give it a nice flush with some CaMg. hopefully its got enough perlite to prevent over saturation of the medium.
Good Luck!