filter carbon

I have a 5 gallon aquarium with a tetra "whisper" filter that uses bio bags for it's filter media. I changed my filter for the first time yesterday and I'm having issues. From what I read on here and other sites, the recommendation was to keep the filter until it was falling apart, as long as I...

In my 12 gallon Nano tank, there is a bag of filter carbon. Now, this thing has been in there for a long time (at least 2 years) but lately with the fish healing thatI have been trying to do, I am being extremely safety cautious about everything... Does filter carbon has an experation date? I...