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Closed top planted tanks

I`ve read about aquarium tops with Co2 injection having " very tightly
closed tops " to keep the Co2 loss
 down a bit . Can anyone share with me how this is done ? I have Tidepool
siphon on the back of the tank and for the life of me can`t see how I could
have this top tightly closed . Not even with a wet/dry on the back . What`s
the trick ?