If your going the airstone route you could stick a bit of foam over the end and use that for your biological filter. That way you can change the carbon without starting a new cycle. I agree that is the problem, and I also agree that you should switch filters. On a 5g you can easily fit an aquaclear or similar. Go all out and get something with a biowheel, you won't be disappointed.
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Yeah, well, you know, that's just, like, your opinion, man.
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