I may have been unclear in my OP.
The fluctuations I mentioned quite often occur over several weeks or even months. For example, my salinity might be at 1.024 for three weeks, then I'll it at 1.025 then in two weeks it might drop to 1.024 again or rise to 1.026.
What I'm hearing some of you say is whatever the number is, it is important, even critical, that number remain the same at all times. Have I got that right?
The same with my alkalinity. Over a period of several weeks/months it has gone from 8 to 9, 10, 11 and back down to 9 then back to 10 over the same period. These are not rapid fluctuations, are they?
And if these fluctuations are a concern, then can I conclude that after 10.5 months the tank is simply not stable enough to be called "mature"?
And for those who asked, yes I have an ATO. It has a 1.5 liter reservoir which gets refilled about twice a week with RO.
