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Filter sponges

Discussion in 'Fish Keeping Chat' started by Burmesemum, Mar 1, 2017.


  1. Burmesemum

    Burmesemum PetForums Senior

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    Hi there.

    I have had my two goldfish for 5 years and have never changed the filter sponges (I just squeeze them out whilst doing my weekly water change. They have lost their shape and become thin and floppy.

    I don't want to completely replace them as they contain the bacteria necessary to keep my tank healthy for the fish.

    Can I put some new sponge in with the old one behind the other sort of thing or do I cut some off the old sponge and put new sponge besides it? As there are two of these sponges in my fluval filter should I remove one and replace it with new sponge?

    Ive been googling but can't find an answer. Can you please advise?
     
  2. NaomiM

    NaomiM Love my furry, feathered and finned family

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    If there's space in the filter for a new sponge, just add that. Otherwise, replacing just one of the sponges shouldn't cause too much of a problem if you squeeze the old sponge out over it, and maybe dose some Seachem Prime for a few days as a precaution.

    Out of interest, what brand of filter sponges are they? I've had mine for over four years and they were second hand when I got them, but they haven't lost their shape or needed replacing...
     
  3. Burmesemum

    Burmesemum PetForums Senior

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    Thanks so much for replying and your help.

    The sponges came with the filter. It's a Fluval UV3 I think it's called.

    I've read that you should wait until they are falling apart before thinking of replacing/adding to it but I'm worried that because they are so floppy they are less effective.

    When I cleaned the tank last week and took them out to rinse in the emptied tank water I noticed that one of them had actually slipped down in the cartridge that holds it.
     
  4. kittih

    kittih PetForums VIP

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    You can replace half as Naomi suggests, squeezing out the old medium onto the new sponge. I tend to put the removed sponged in the water current or near the filter intake for a few days (preferably not in the light) so that the bacteria still on the sponge have a fighting chance of removing ammonia / nitrites whilst the population on the other sponge builds up. Not sure what difference it makes but it can't hurt. :)
     
    NaomiM likes this.
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