carbon

Carbon does not dissolve into the water! It absorbs chemicals from the water (like metals, medicne traces, tanins), but gets saturated pretty quickly, and then it starts releasing the absorbed chemicals into the water again. That's why it needs to be replaced everey 3 or 4 weeks...

As for your filtration: I wouldn't use only carbon! Fill up at least one with biomedia (for biological filtration, to maintain the tank cycle). The other one could be filled with carbon, but that's not necessary: most people only use it when the water is colored too much, or when they have medicated their fish. I think it's all up to you what you want to use in your second filter!

bgshortys said:

can I remove my carbon all at once, or will that disrupt my tank since i have been using carbon for about 5 months now (but i change it)

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No problem: carbon has nothing to do with your tank's biological filtration (ie. the tank cycle). All it does is chemical filtration (ie. absorbing certain chemicals).
You can start and stop using it abruptly, since the carbon itself doesn't affect the water perimeters to any significant degree.
Carbon is a filtration bonus, so to speak (an non-essential extra): only biofiltration is 100% essential!

So just go ahead (I did it too, a few months ago, and I experienced no problems whatsoever)...