Thank you people for the advice. Note to myself: only use RO or rainwater.
This is giving me some questions. Is it smart to empty the the tank till 1/2 or 1/3 of the total volume?
Total volume is 30L, at the moment it’s filled with 21L of water ( 14L rainwater and 7L tapwater ).
there are some plants and a piece of wood in it.
What is a reliable testset for water parameters? One without strips please.
@Vale! : I don’t know what to expect. Just wanted a balaced tank with the right parameters.Was a bad idea to ad tapwater.
Will try to test my water as soon as I’m home at Friday.
@PatrickG: The plant substrate was at the aquarium kit that i got presented.
I only used it in a small amount, 1cm thick and only in a corner thst cover max 1/4 of the bottom the tank. The water threatment products where in the kit to, did only used the water threat ment for the 7L tapwater that i used, in mind thst it could not harm.
Because I’m in Aachen for my work, I did a small walk in the city and found a cheap euro store that where selling small coffe machines for €5,-. So I picked 1 up for some testing.
I want to put some pulverized/shredded oak leaves in the filter section and run the machine on rainwater. Wanna test the water and wanna look if I can use it to tane the water en lower the PH.