I'm asking because I'm setting up a new tank, and the only filter I have is one for 2-5 g. The tank is 3g, and I'm worried that my fish's tail will get caught in the intake. I was planning on putting some pantyhose over the intake, but the only way to hold it to the filter is with rubber bands. It's an electric filter, so I can't control the flow of water (you're supposed to be able to, I think, but I can't figure it out).
Hard to say...each one is different.....maybe every month or so and sooner if they are the thin ones...I use the ones that I get on my newspapers....lol....so nothing special and I only use them to hold my homemade filter media together...also they don't seem to snap just degrade and fall apart so I wouldn't think it could cause an injury like if you used a rubber band to pop someone....
honestly I've heard thread works really well if youre looking for something that lasts longer...I use thread in mine (a few small strands of black) and they havent degraded yet...been a couple months
Nothing wrong with using rubber bands. You can always replace them when you replace your media or clean your filter. I've got a stocking around my intake that's just lodged high between the tube and the glass.
I've had problems with prefilter tubes clogging and building up gunk/bacteria to the point where the flow is just dribbling. That was in less than a month. Rinsing doesn't seem to work.
As OFL said, the rubber bands will just sort of deteriorate.... they don't really "snap" when they finally fail. They just sort of break & fall off (or just stay loosely wrapped around the pantyhose), so they wouldn't be a hazard to your fish. You'd probably just need to replace the rubberbands about once a month, so you probably wouldn't have any fail on you if you swap them regularly.
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