HI RICHARD7467, WELCOME TO FISHLORE!
I would suggest taking the carbon out and replacing it with floss, sponges, or more (any biological media) bio stars, rings, balls. Don't fall for those medias that promise to absorb ammonia, or phosphates, as these end up being a problem. You can use peat in the canister (in a bag), if you have high ph and want to lower it naturally, only do this though if your tap water is 7.8 or above and you want to keep fish that like 6.5 for example.
What are you cycling your tank with? Fish, or are you doing a fish less cycle? Enjoy the forum, and tell us all about your tank plans.....
