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2Hr Aquarist Commentary: A surface skimmer helps to improve gaseous exchange, which is essential for increasing CO2 levels safely. I would not run a planted tank without this very simple but invaluable device. A device like this is both cheap and effective.
If you have a smaller tank, the one by Koller is more compact and may fit better.
Note that this is a 3rd party product sold on Amazon that I have used or have experienced to a degree that I'm fully comfortable to recommend. If you do buy the product through the Amazon link below, I do earn a small commission (at no extra cost to you), which helps in the running of this website.