I have an AquaClear on my 29G....do I really need the carbon all the time? It has the bio max cylinders in a bag as well as a sponge. I also have a Penguin BioWheel on my 10G....do I really need carbon in this filter? I was thinking I could get some of the cylinders and sponge that I have in my AquaClear filter and put that in Penguin filter. Thoughts?