Ok....... so some questions first..
What size of tank?
What method are you using to add Co2 to the water?
When you say adding hefty amount how are your determining this? And what do you consider hefty?
Lights come on at what time? When does Co2 come on?
How planted is the tank?
What do you have for circulation in the tank?
Whats your lighting?
Did you try to use the drops that came with your Up Aqua drop checker? Whos 4dKH?
Where is placement of drop checker? Where is placement of Co2 outlet to tank? How long does it take to turn yellow?
These are all things that can effect your issue. Do your fish ever gasp at surface or stress? Hows your growth?? Ever get pearling? If your fish are not stressed or gasping then you should be ok as youve not hit their threshold. It is the most important. Not what the drop checker tells you. As ive tried to tell others Drop checkers while useful are far from accurate. Sorry for so many questions but trying to nail it down to what it is cause so many things can affect it.
Tank is the 60P in my journal, 17G
CO2 is injected with an inline atomizer.
A hefty amount of CO2 was bubbles that I could not count and resulting soda water. This is a 2 month DSM HC transition. First week. Been slowly dropping down the CO2.
Circulation is provided by an Eheim 2028 at full blast.
Lighting is a 2x24w catalina t5ho. One bulb is being used 8 hours a day. HC pearls like crazy.
The drops that came with my drop checker would not go past green, so I ditched them months ago on a previous setup.
4dKH is from GLA
Drop checker is in back left hand corner of the tank, lily pipe front right hand corner.
Drop checker turns yellow an hour after replacing the fluid and putting it in the tank. Never turns green or blue again aside from being blue initially with 3 drops of API pH tester. API was produced 3/2011.
I fully realize yellow is a lot of CO2. I have no fish. This is a DSM transition, so I really don't care how much CO2 was in there. I'm just trying to figure out what's going on with the drop checker as I begin to drop the CO2 levels down to normal levels in preparation for stocking. When I raise the lily pipe, there is a LOT of surface agitation. I can hear it from across the house. This is why I am confused about the CO2 not off gassing at night.