Hey
@Rolltideroll0420 , did you and your brother ever solve this?
I've had similar symptoms in my plants (veins turn yellow, edges burn up) in my thread here:
https://www.rollitup.org/t/early-signs-of-yellowing-veins-dying-leaves.1074024/
In my case I think the issue was overfeeding, but it's hard to pinpoint the real issue.
I use a lower feed now and no longer have yellow veins, although my plants end up with other issues a few weeks later.
My setup is similar to yours, so maybe we can compare notes: I use Rapid rooters and GH Flora trio. For the first week I use equal parts of the Flora trio, measuring EC around 100ppm - 200pm for the first week (on a ppm scale of 500, so that's around EC 0.2 - 0.4). I also started using a humidity dome for the first week and that makes a huge difference with the root development - rather than developing just a single long tap root, I end up with lots of roots branching out from the rapid rooter.