Co2

[FKIDN]

Now I’m not sure if this is going to make me sound stupid or not, but if I were to get some airline tubing and an airstone and blow into the tank for maybe 5 mins a day, would that benefit the plants ?

 

[connorlindeman]

When you exhale, the air you exhale apparently contains around 4-5% CO₂, which is higher than the atmosphere (0.04%). While that’s more CO₂ than the tank water naturally absorbs from the air, the amount you’d add in just minutes of blowing is minimal compared to what plants would need to show noticeable benefits.
There would be no benefit.