Regarding the ph levels,
It does not gets above 8.0. I run both a 2 chamber CaRx and i dose about 1L per day from a Kalk Stirr. I was expecting that would push it up but it does not.
It just settles between 7.8-8.0, which i know is not bad, i was just expecting it would be higher given all i am doing.
I usually run GFO constantly, but none for the past 6 weeks. I will stop that and only use when necessary.
I will start by doing a 80 gallon WC and will start by adding some Lugol
Appreciate the imput