I got a free sample of this stuff with my fluval 406 canister filter and it seems to be doing a good job. I don't know how often it needs to be replaced. Have any of you used it, and if so, how often do you replace the stuff in the media baskets?
Is this in new, cycling tank?So far nitrite is staying at 0ppm. If there is going to be a spike, how long would it generally take to appear?