Welcome to TFK! An airstone is not necessary, in my opinion. I don't use them in any of my tanks. All my tanks are planted and I don't want the water's surface broken as that would affect the O2/CO2 process required by my plants for optimum conditions. Some people simply like the looks of a wall of bubbles. Not me.
Once again, wlecome to the forum, I hope you'll be happy here!
I've nothing to add to what kymmie advised. Unless you have reason to suspect a problem...?
Byron.
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Tropical Fish Keeping
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forum community dedicated to tropical fish owners and enthusiasts. Come join the discussion about species,breeding, health, behavior, aquariums, adopting, care, classifieds, and more! Open to fish, plants and reptiles living in freshwater or saltwater environments.