Planted Tank Obsessed
Join Date: Dec 2016
Location: CT River Valley, CT, USA
Turn it up a touch, wait a few days to make sure your fish are fine. If they're still good after a couple of days, turn it up a touch more. Repeat until you see your fish lethargic and hanging out near the surface. Once you see that, turn it back down a touch and monitor for a few days to make sure they're good. If you have your CO2 timed to your lights, you'll want to pay particular attention to right when the lights turn on, and just before the CO2 turns off in the afternoon. These are the times that the CO2 content will be highest.
Also keep in mind a few things that can affect the CO2 off-gassing, like filter flow, surface agitation, or surface film. You don't want to suddenly have less gas exchange because of a protein film and gas all of your fish.
If you ever think you're too small to make a difference, spend a couple of nights sleeping with a mosquito.
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