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I have read the other threads and this is normal, but my question is should I put carbon back in my tank to help with this? My water parameters are all good, just hard water and higher pH but been doing frequent changes as my fish was sick and is not (at least no signs on parasites) but his fins still are showing signs of fin rot.. I am concerned that the water is somehow part of this. Could the lack of carbon and floating bits for cycling causing my little guy to get rot still? I realize his internal parasites could also have weakened his immune system so possibly just that. I am just questioning if I should put the carbon filter or a carbon bag back in- thanks!