I recently counted 135 corals in mt 75 gallon tank haha. i keep my alk at 8.5 but im sure it drops at night considerably. i do regular water changes weekly and dose accordingly. So i guess im wondering when and what made you start using kalkwasser? was it a certain instance or event? or was it just over growth and research you decided to expirement? and what were the results after you started using? thanks from dato's lagoon