Sponge Replacement

phamh

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Hi guys. I've learnt that you should change your biochemical sponge frequently and my question is why? Yes, I know how recycling works: NH₃ -> NO₂ -> NO₃. And I also know that the filter is there to cultivate the beneficial bacteria - Nitrosomonas, Nitrosospira, and Nitrospira. I just need to know why we should change the foam once a month (this, of course depends on the fish-gallons ratio). Are those biochemical foams coated with a layer of germs that die out over time or something? I really hope someone would explain this to me. Thank you.
 

KarenLM

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Welcome to the forum! We're glad you joined us.

I have not heard of changing the foam, in fact I have heard the opposite - don't change it. If it gets dirty just swish it in some tank water in a bucket during your WC. I clean mine quite vigorously with my hands once in a while. As long as it is wet or in water the BB will remain viable.
 

Coradee

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Welcome to Fishlore
If you change your media every month you're losing your beneficial bacteria, sponges only need changing when they're falling to bits & that can take many years.
The only thing that needs changing every 3-4 weeks is activated carbon if you use it as it loses its effectiveness after that time.
 
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phamh

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Hi guys. Many thanks for your welcome and your quick replies. I swear I've read it somewhere that you should change the foam every 4 to 6 weeks, which really surprises me since it makes no sens at all. Thank you for clearing that up. Just because of that I've ordered 10 sq ft of foam on ebay :'(. I really have no idea what to do with them now.
 
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