I change the Water now every 7days. Actually, the tank is not the big (around 23Liters).
For the moment, everything looks pretty good. The PH is stable, the temperature is between 20 and 22C and I added a 2nd Bubbler to the tank.
Next to the existing tank, I started to plant some seeds. But after 5 days, only 2 seeds seem to be ok. And the sad thing is, that they are both in the same Rockwool cube. Why the others don't grow is a bit mistery to me. Maybe too dry?
I moisten them every day with PH corrected water, but the become so fast dry again. Hm. I'll have to find a good cycle.
And now, some new pictures about the existing setup and how you can see, have my chilis grown a bit. A little bit, but a bit.
I'll keep you up to date...