Some of you might be following my 150g build which will be a planted discus setup. I've finally got my Apex Neptune configured, the CO2 reactor and regulator set up, and I've been watching the pH over time. After a 50% WC (3 parts RO to 1 part tap), pH jumps to about 6.70 and then slowly slides downward over time. After 48 hours it's down to about 6.3. From what I'm finding online, Landen is known to eat KH, which isn't a huge deal, but it will take a little fiddling around to keep CO2 concentrations at a reasonable level. I'll be running a low-medium light setup, so I'll have a little leeway, but I'm wondering if this KH drop settles down some over time. There are no plants or livestock in the tank yet.... still getting everything configured.
Anyone track this KH response closely enough to know how it behaves over time?
Here's one 24 hour period after a waterchange. No CO2 during this time:
Here's another 24 hour period that included a CO2 test for a few hours. The controller maintained the setpoint perfectly, with the expected pH rebound with the CO2 off. During this time, an airstone was running. As you can see, the pH never recovered to the initial level, and started dropping again, as always, as time goes on:
Anyone track this KH response closely enough to know how it behaves over time?
Here's one 24 hour period after a waterchange. No CO2 during this time:

Here's another 24 hour period that included a CO2 test for a few hours. The controller maintained the setpoint perfectly, with the expected pH rebound with the CO2 off. During this time, an airstone was running. As you can see, the pH never recovered to the initial level, and started dropping again, as always, as time goes on:
