Administrators Cory Posted May 11, 2022 Administrators Share Posted May 11, 2022 On 5/10/2022 at 4:20 PM, gjcarew said: When you see the typical "gasping at the surface" from injecting too much CO2, the fish is not trying to breathe atmospheric air. The water at the top of the water column is more oxygenated, so they go there to catch their breath. If you don't promote gas exchange with airstones, skimmers, or whatever else you run a FAR higher risk of suffocating your fish. Let's say your light malfunctions while your CO2 is on-- the plants aren't making oxygen anymore. Even at low CO2 injection levels the aquarium can go anoxic fairly quickly. You need ample gas exchange at the surface to ensure your fish will survive until you notice something wrong. I run high CO2 levels for the most part. As in so much that a bubble counter is useless. At the same time, I have my canister filter outflow pointed towards the water surface and an airstone turning on for 5 minutes per hour, as well as going nonstop when CO2 isn't on. I have never had any trouble injecting CO2 at 30+ ppm. Sure, I may have to refill my CO2 tank after 20 rather than 22 weeks, but it's 100% worth the peace of mind of knowing the fish are safe. The key here isn't how much co2 you put in. Co2 and oxygen are independent in the water. It just so happens that people try to not gas off co2 and therefore have poor oxygen. Another side effect is that when plants don't have a light they consume oxygen. When using an oxygen meter, non co2 injected tanks, with high plant loads or very high fish loads, would have low oxygen before the light comes on for the day. This happens regardless of co2 injection technically. This is why it's important to educate people like you have, to have good gas exchange and not limit it to "preserve co2" at the expense of oxygen. You can 100% have both high levels of oxygen and co2 in aquarium water. Link to comment Share on other sites More sharing options...
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!Register a new account
Already have an account? Sign in here.Sign In Now