Yo mate hope you are good like the setup.
You can tell me to piss off and keep my nose out but I would say that you might b overwatering. I ran a 8 pot Wilma with 5” grow Dan cubes and found that until they are 2-3 weeks old they only need a drink once every few days. Get a moisture meter(cheap) and this will help a lot. Less is more with hydro. The green algae appearing on top of the Rockwool is a symptom of overwatering as is slow growth and drooping leaves. Hope that help. 👍
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