Have only done rockwool. But 420 sometimes does a mix of rockwool and coco, and IIRC, he has written that results are ~the same.
Semi-related ... I have simplified germination. No more paper towels. A three hour soak in 1% hydrogen peroxide, then right into a starter rockwool cube. Has worked every time, and no more worry/fussing with the tap root. I throw water/nutes to the seedlings however many times a day. Rockwool drains right through. I don't see a need to worry that.
That’s a great way to germinate. I had a problem with the tap root when putting it into the pot.
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