humidity ist too high, so I started trying some things like getting fresh air. but summer is very hot and humid right now, so i ordered a dehumidifier.
Now humidity @ 60% / 23°C
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added the dehumidifier which works very well in the basement. humidity is around 65% which is nice for this time i guess. next week i will reduce it to 50%.
also I will lower the lights and bring more ppfd to the plants :)