Can you get us a runoff pH number as soon as possible?
The HydroHuts made about 1-2 years ago outgassed toxic fumes that killed plants.
But you have other stuff going on, like the taco leaves that say your heat is too intense and your humidity too low.
Those stripes DO resemble damage from a severe Mg deficiency but don't look quite right to say for sure. Even so, making up a spray bottle of 1/2 teaspoon epsom salts per quart of water with one drop dish soap, and LIGHTLY misting the plants with it, NOT ON THE BUDS!!!, will halt the spread of Mg def if that is what it is, and not harm the plant if it isn't.
But get that pH number asap. You may need to do a heavy flush very soon.