I've been at this hobby for a little over two years now and haven't experienced success with sps until February of this year. Now my parameters are almost rock solid and my tanks consumption is small enough that kalkwasser is all I need to replenish major elements. For the past 2 months I was putting in about 3/4 of a teaspoon of kalk per gallon but the last time I had to change auto top off water I upped the dosage to 1 teaspoon per gallon. The extra kalk along with opening windows more often in the house has my Ph at 8.5. Do you think it's time to switch to two part or is 8.5 ok? The thing is that the ph is still trending upward. Here is a pic from my most recent tests.