<span class="link_user">@Sonnenerde</span>, thank you for your comment - I've started a new grow today, again in Bio Hanferde and put the seeds directly in - I've read that Sonnenerde is very nutrient rich and thus a little hot for the seedlings.
Thanks, I'm pretty happy with Bio Hanferde so far - the Strawberry Gorilla Auto plant looks excellent, I agree, but Lemon Pie Auto is suffering a bit, after some watering issues, including 2 floodings with some runoff, due to some difficulties setting up the Blumat properly.