I really like a good size stone, about 3 inches. I didn't need the suction cups that came with it. I just buried it under thin even gravel, it has enough weight not to climb up on its own. I adapted this to a 40 gallon Tetra air pump. Good bubble action is not 100% yet, let's see there will be time. I read that people had problems with the tube. Yes it is very flexible and very long (about 8ft or more I think), I think I used about 6ft. It's actually not a bad material at all, it's amazing that it doesn't pinch and spreads easily since it's so flexible. Only 2 suction cups for the hose are included in the kit, wish there were more so I could mark another one in the tank and a check valve which is needed otherwise water can easily get back into the pump if the power goes out or in the event of a power failure. Overall I am very happy with the purchase, I have everything I need to hook up my air pump at a reasonable price. Would buy again if needed.
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