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When I tried using airdromes I would bury the tubing in the sand and make trails out of river stones to make it look more natural like. Of course I Java dojo loach that dug them up for me anyway
I used to run them under the sand and then put the air stone into a decoration. Wrapping plants (even fake ones) around them is cool. If you run the tube in the back of the tank and have a lot of good plant growth you won't see em