Posted: Tue Feb 21, 2006 7:49 pm
I have an Aquaclear 50 as well. You don't need to change the biomax, just rinse it in the tank water to preserve the beneficial bacteria. I have a container that I fill with tank water before I change it and do a cleaning. I keep the biomax and the sponge in it (I swish them both in the tank before doing this to get rid of as much debris as possible) until I'm ready to get the filter going again. The sponge/foam should last a good while, just clean as above.
As far as the carbon, I'd have to look at the package the extra carbon (that 3-pack) came in. It will probably say a month. The filter is a fairly recent addition, and I've only cleaned it once, three weeks after I put it in the tank (that was about a week ago); I did change the carbon at that time. The filter wasn't very dirty, but it's being used in a 10-gallon tank with a very small turt. And, I did do about a 50% water change half way through that 3-week period.
"You become responsible, forever, for what you have tamed." -Antoine de Saint Exupery-