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If you don't buy check valves. I always like the air pump to be above the tank. So I'm using gravity so the water can't go back to pump. We really should take advantage what you can do in the hobby. Especially to eliminate valves ,pumps, ect...
While I agree with your statement, to a degree, an airline check valve hardly is anything to avoid. It's a simple precautionary device that costs two bucks. No big deal.
As for eliminating more valves and things in filtration setups, the better. But that's just because of flow restrictions, not because it harms the system or is less natural. I don't see the big deal about using a pump, if needed, or people setting up a quality system the way it works for them. A precautionary device should be encouraged, not discouraged. Not to mention, a lot of people have an air pump below the tank simply because they can be loud. Better safe than sorry, especially when it's such a small and easy thing.
Check valves would be a lot easier if mine would work though.
I did just now and neither will let me blow air through. I'll just take them back and order a bunch on amazon. Kinda bull**** tbh.