02-01-2012, 12:57 AM
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the only tank i use carbon on is my 55, because the rite size pads for my penguin have it in there already. And I only change them probably every 6 to 8 weeks, when the pad gets plugged up, so the carbon aint doin squat. I used to use carbon, didnt notice a bit of difference when I stopped.
a void in your hob filter, provided the sponge covers the whole of the surface area ejected by the filter, will not affect its performance. If you have a filter with carbon in it, and just dont readd the carbon, it wont hurt anything. I would find it unnecessary to replace the carbon with a sponge or what not, in the vast majority of applications :)