I really suggest transplanting into either solo or coco, but not a mix. And possibly having a couple more beans on standby. Being autoflowers, and heavily damaged, there’s a slim chance they’re going to really produce the way we all love. Autos normally start flowering at 3-5wks from sprout.
With coco, you have to feed it from day 1. No plain watering unless a flush is necessary. But instead of going feed, water, water, feed, or something like, it’s feed, feed, feed, feed. You want ppm’s right about 1,000, at the mentioned pH range.
In soil, depending on brand, it’s weekly feeding, with plain, pH’ed waterings in between. Most cannabis friendly soils have enough nutrients to last 4-6 weeks. Usually when runoff hits the 1,000 area it’s time to feed. And when feeding in soil, it’s recommend to mix nutes at 1/2 - 3/4 strength