Both fish and plants need oxygen.
Canister filters do nothing for oxygen.
Heres my take...
If CO2 is injected properly pay no mind to surface agitation or CO2 loss. Are we trying to keep CO2 inside the tank? No. We are trying to provide CO2 when the lights are on, when the plants need the CO2. CO2 is continuously injected into the tank for the duration of the light cycle to provide this for the plants.
IMO the whole idea of low surface agitation and the entire concept of keeping CO2 inside is a bad idea and gives the planted tank a bad wrap in regards to livestock.
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