Same here but that's for the ones that attach to the side of the tank.
The ones that sit on the substrate are fine.
I never had any problems. As any other filter, you want to rinse them in old water every few months so the water flows better.
Sponge filters are great and I think should be used by every one
With one pump I can filter 3 tanks... I think it's great!
Thanks Mo & vilmarisv! Good to know there's not many issues.
And ooh - I like the idea of running several filters off the one pump! My pump could certainly handle that.
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