Hope it's ok to re-open an old thread. I tried this method last night using dry ice. Becasue my tank is a plaudarium (with water containing fish at the base), I had to remove the plants & do the dry ice process in another container. I used an esky which obviously does not have transparent sides as does an aquarium. My query is, how does one know when the container is full of CO2? When I did the procedure I left the lid open only a small gap of 3mm I found when I opened it a couple of minutes after putting the cups of dry ice (with warm water poured over it) in to take the cup out (so as not to lower the temp too much & kill the plants, that the fog no longer filled the esky. I'm now not sure if this is becasue the CO2 had become transparent or becasue it had dissipated & been replaced by air.
Thanks for your assistance!
Laura
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