I wanted to add an airstone to run a sponge filter in my 125g and I want one in my 10g quarantine. I was researching air pumps and was ready to buy but then I fold these old air pumps. They are more than 20 years old. I only had some old tubing and an airstone from the battery backup pumps that just arrived. Both seem to work. Is there any reason not to use these? I read about all these new ones possibly breaking rather quickly (some claim their diaphragms failed on a Tetra one within a few months). I figure I might as well use these till they break then get new ones. If they break, the tanks will still be well oxygenated so there's no danger there. Edit: For anyone that recognizes old brands, here's what I have: Second Whisper Challenger III, has two outlets and it seemed to run the cheap airstone all the way at bottom of 125. Hi-tech pump 320. Says "Spot Brand", Ethical products INC, Newark NJ. This box says copyright 1984. This I'll use on the 10g QT.