HELP! NastayNatron's tank

[Cal_stir]

also, is he adding kalk to his top off water? if he is remove it as well and top off manually, the kalk would be stored in a reactor of some sort or mixed in a top off container.

i know this is all complicated if you are not familiar with it but you must find the reason for the high PH or it will go back up overnight.

[Gripenfelter]

I would do some large water changes and check all the water parameters.