Posted: Thu Oct 12, 2006 7:31 pm
Small tank that can't hold much water (10 gallons max, and it can't even be full or your turtle could escape) and a dinky filter for a turtle that size (may be OK for a small hatchling, but not for a 6-inch turtle)---not counting the head and tail maybe the shell length is more like 4 inches?--- that's producing waste) equals a smelly tank that needs frequent cleaning (more than just every two weeks).
If you have gravel/a lot of pebbles in the tank (you didn't mention if you did), that will only magnify any smell (traps poop and other debris).
Before you start experimenting with products like Biozyme or testing the water (the results won't be good after even a few days), do your turtle and yourself a favor and get an appropriate-size container (a tank or even a Rubbermaid storage container for the time being) and a better filter. Allow for ten gallons of container per inch of shell length and get a filter that's for a tank about 3X the one you get for your turtle. Bigger tank, more water and better filter should take care of the smell.
You said your turtle is 2 years old and has doubled in size the past few months. Why is your turtle suddenly been growing so fast? What is the turtle being fed, how much and how often?
"You become responsible, forever, for what you have tamed." -Antoine de Saint Exupery-