Posted: Sat Oct 14, 2006 1:16 pm
What filter are you using (the word "cartridge" sounds like it's a submersible or H.O.T.)? If the media you're using includes charcoal and you've had it in the filter for more than a month, it probably should be changed. Something sounds like it should be changed and/or rinsed out better (are you rinsing the sponges and biomedia, if the filter has any, in the tank water)?
Aside from rinsing out the filter, did you change the water in the tank? A small tank (if that's what you have) needs fairly frequent water changes as well.
"You become responsible, forever, for what you have tamed." -Antoine de Saint Exupery-