Originally Posted by toddwcpa
I thought of that but thought that I would end up with too much air for a small bubble wall. Ended up buying the cheapest one (Top Fin brand). Seems to work fine for the job so far.
The real question is whether the fish need added air in the aquarium. I have a canister filter, so the water's surface is never broken.
That's where the three way or gang valves come into play. They allow you to divert the excess air and control the amount of air going to the bubble wall.
Is adding air needed? It depends on the size of the tank, filter throughput, and bio-load. Most folks add them for aesthetics but they do a good job moving water to the surface where gas exchange can occur. One negative is the splash/spray produced by the popping bubbles. It kept the underside of the hood wet and combined with the lighting, became a mat of algae. There's also the crusty deposits left on the hood and tank rim.
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