[quote=”helene” post=1237]I often find that gravel is a big problem in changing water parameter, – some gravels might have a big influence in drawing up parameters such as ph-value.[/quote]
Yes, that’s what I think.
I set this tank up for fishes that like average water equivalents (neutral pH, middle hardness) – with no focus on very special requirements.
I often make water changes only with rain water – because I do not want to amplify the hardness. And the conductivity always raises up to 250 µS again ……..