@Vdxiii i'ld check the ph on the Blue Dream. And also the nutrient content that your soil had, and everything you eventually have put in.
Iron becomes unavailable above 6.5 Ph in soil. Calcium becomes unavailable below 6.5, so is super important to fluctuate the Ph between 6.4 and 6.8 in different days but +- 0.2 difference won't cause no harm. ideal is around 6.5 Ph.
It really looks like a big iron deficiency, and even calcium and nitrogen. I've seen a couple Blue Dreams with the same identical look and problem in the same reservoir with other healty plants.
Too much Phosphorus in the soil can cause the calcium and the iron to become unavailable to uptake (because they react together to form new molecules, basically the salt buildup).
If you think the issue is Ph (i'll suggest to monitor it anyways with some kind of meter that you stick in the substrate, as well as measuring and adjusting the ph of the solution when you water or fertigate) just try to get it within the right zone..
If you think the soil already has a lot of nutrients in it, maybe in unbalanced NPK ratios, go for a flush maybe combined with foliar feed).
If you simply never fed her the amount of goodness she needed, you should feed her the proper amount of iron, calcium, nitrogen, and balance the levels with K and Mg as well as keeping the phosphorus low possibly, and super important balance the PH.
Can you tell me the brand and the name of the soil, and of the nutrient you are using? i'll try to find the composition of those and figure out if things are right with all the nutrients listed above and if the ratio is right.
How often do you water them, how ofter do you feed them, and how do you figure out how much nutrient to use?
Foliar feeding can surely work in every case i think