12-12-2014, 08:22 AM
Join Date: Jul 2013
Location: McKinney, TX (Dallas/DFW)
| | Re: co2 is it safe?
Atmospheric CO2 is considered a trace gas since it's concentration is naturally so low. A slow leak in a canister would quickly dissipate. At best, if it somehow built up under the stand, as soon as you open the door it would thin out. As for toxic, also no. You exhale CO2 all day long. Its a natural compound that is relatively inert (that why it's used by welders).
For the fish, if the levels in the water get too high, the fish can have a difficult time "exhaling". There can be plenty of O2 in the water. When this happens, your snails, fish, and just about everyone else starts climbing to the top of the tank. The CO2 will be lower near the surface where it can outgas into the atmosphere.
As Tanan said, there are plenty of things you can do to protect yourself from hurting the fish. As for yourself, short of doing something nuts like holding it upside down and cracking off the valve stem, you'll be fine.