Interrelated parameters confusing
So, our tap water is 10 dkh. It has a degassed pH of 8.2. I have been looking at the relationship between pH and KH. We have a strong light and, as I understand it, that means that we should get our CO2 in the 30 parts per million range. This raises all kinds of questions.
1. With injected CO2, do we worry about a pH swing every night? I am not using, nor do I want to use, a pH controller. If I provide a significant amount of injected CO2 during the photo period to balance my high lights, and then if gas is turned off during the night, are not significant pH swings created that are harmful to fish? I measured my tank just before my CO2 kicked on today, and it was 8.2.
2. Is the drop Checker useful to me considering that the solution KH is 4? It seems that if I shoot for a green drop checker (reflecting a pH of 6.8), I will be shooting for a pH that is significantly different than the normal pH of my water when it is degassed (8.2). So, should I adjust the dkh of my drop checker solution to be more in line with my water hardness?
3. What is the best approach with surface agitation, given my goals of not wanting to see large pH swings as CO2 is off gassed, but also not wanting my fish to die of oxygen deprivation when I need to give large doses of CO2 and also have them survive the night when no CO2 is being injected, but when CO2 is high from having been injected during the entire photo period? My tank is a 120, and I run two Eheim 2217s on it. I have a gentle ripple in my tank surface water going now. The spray bar is positioned about 2 inches under the surface pointing slightly toward the surface and toward the front of the tank.
4. Is the term "stable CO2" related to a stable pH level 24/7, or more related to a stable amount of CO2 put into the water table daily? I've read it both ways, and I'm confused.
So, to sum up, what is the best balance (stability?) that I can work to achieve between my higher dkh, my higher pH, my drop checker, and my surface agitation (or, more importantly, oxygenation for fish health)?
Tanks a bunch!
My current 120 tank journal:
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