So I spent the $125 and got a Fluval for my turtle tank (one turtle). After some cursing, I managed to figure out the set up, and it's working fine. I used the media that came with the set up: "bio-max" and some powdery stuff which I'm guessing is carbon. How often do I need to change these things? Am I using the right media? Should I be testing the water (I'm clueless about this one - where do I get "tests"
. I'm really trying to learn and do the best I can for my turtle. Any help would be appreciated.

