Unreliable, waste of money. I bought 2 of these for my 75 gallon tank. They don't stick together, they don't float or suck, almost no air flows through them and the end connection is much thinner than a standard hose. One "useful" suggestion was to poke holes in it to get more air. It didn't help at all. I can't stress enough how poorly made they are. And everyone who gave it 5 stars either didn't get the same as me or they have very low standards. Save money and buy something else.
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