So I have an issue that i can't seem to find a solution to online anywhere. Over the past few weeks my alk has slowly been rising. I run my mixed reef normally at 9 dkh but over the past weeks it has slowly been creeping up, currently 9.6 confined by a Hannah checkers and a salifert test. I am not dosing anything at the minute and am doing 10% water changes weekly. My salt mix mixes to around 8.6 but even the water changes don't seem to bring it down. Anybody have any ideas what could cause this?
Tank parameters
Ammonia 0
Nitrite 0
Nitrate 10
pH 8
Dkh 9.6
Calcium 400
Magnisium 1300
100 liter mixed reef mostly frags at the minute
Tank parameters
Ammonia 0
Nitrite 0
Nitrate 10
pH 8
Dkh 9.6
Calcium 400
Magnisium 1300
100 liter mixed reef mostly frags at the minute