
Originally Posted by
Urban Aquaria
Co2 drop checker showing green should still indicate okay levels for livestock (assuming the reading is correct and you used pre-mixed indicator solution, or 4dkh water to mix with reagent, not aquarium water).
Ferts usually don't affect fishes that much too, unless you massively overdose alot of it at one go.
Maybe check your tank's ammonia, nitrite and nitrate levels, see if any of those parameters spiked up and accumulated to high levels, those can affect the fishes.
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