Carbon is not really needed unless trying to remove things like meds, odors, etc. I'd replace it with some biomax (ceramic rings). Just do it slowly as any BB you might have could be on the carbon too .
what kind of filter do you have ?
What do you mean do it slowly? The carbon is in a small bag. I can't remove part of it.
I would remove the carbon it only works a few days before needing replacement , and put in a sponge , if you want chemical filtration , puregen or chem pure work great and will last almost forever on a small tank like that
If your tank is cycling you should just leave it alone for now.
Why do people think they need to mess around so much with a cycling tank?, all it does is delay the entire process.