i want to know if i got this (finally)!!! my 80 gallons of water in the 90gallon tank has a Kh of 1. between 15 and 20 mg/L CaCo3 before lights on, with a new pair of calibrated pinpiont ph probes, one on each side of the tank ph reads 6.45 and 6.44 the tank also has a grounding probe in it. 1 hour and 15 min before lights on, co2 turns on. when lights come on ph is at 6.09 and 6.05. this tells me (if im right that i have close to 30ppm co2) as the photo period goes for its 9 hour cycle the ph drops to 5.95 and 5.89. this is OK, right? do i have this? or is co2 to high ? i remember reading something about the kh shifting slightly when lights and co2 start but i'm fuzzy on what that was.. can anybody clarify?
So is there anything that makes you suspicious that there's not enough CO2?
Or too much?
I have a KH of 1, no issues.
I watch the CO2 carefully, some tanks are easy, some are harder, more troublesome to get the CO2 just right.
I obviously have a lot of Cardinals:
It's tough to say what the CO2 really is or is not.
At least with the methods we have, none are that good truthfully.
I think unless there's an issue, like a Biological "test", is better for most, dial it in with the DC and the pH, then eyeball and progressively adjust slowly and in small increments.
If you have good current and moderate/low light, there's never much of an issue here.
FYI, cards........I've seen them in pH of 3.7-4.2 pH.
No KH was measured etc........
CO2 gassing from respiratory issues, not pH ......is what stresses/kills fish.