For my 3 feet tank i change my sponge every 2 week at first now a litter bit lazy so i change every 1 month. It depends how dirty is your sponge if after 2 week it look very dirty then u need to change if not then observe another week then.

For my 3 feet tank i change my sponge every 2 week at first now a litter bit lazy so i change every 1 month. It depends how dirty is your sponge if after 2 week it look very dirty then u need to change if not then observe another week then.
actually i don't change but it has worked for me (at least for my old planted ) for at least 1yr+

I think it depends on your tank size and amount of fishes you have in it. Lesser fish lesser frequency of changing sponge. And yup check how dirty your sponge is![]()





Which sponge are you guys refering too? OHF? HOF?
This two filter I used it before, but I hardly change the sponge for my srimp tank as I afraid that might remove a ll the good BB.
goody992828
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