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I was rinsing in un-treated tap water, that may be part of the problem. I am actually wondering if we have something wrong with our tap water- I've always been a bit disturbed by how "hard" the water tests for one thing; maybe there is something toxic in it that is removed by the charcoal...

so I have this problem- I have a 30 gallon tank. I used to have a hang-on-the-side filter, things were good for years, the filter broke, so I replaced it with a fluval 205 canister filter; I dumped the ceramic bio media from the old filter into it, and it has sponges and a bag of mixed charcoal/...