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Old 11-19-2012, 09:53 PM   #15
lochaber
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DogFish has some good advice up there.

I just want to second the bit about carbon not being necessary. The two main uses I can think of are trying to remove either medication or tannins from the water (which I would suggest not doing, they can be pretty beneficial to both plants and fish).

Back when I started, I had one of the old Tetra HOB, and it had a similar cartridge system. This was back when I still thought carbon was necessary.

I'm not sure specifically what I did anymore, but I cut open one of the old cartridges and either reclosed it, or encased it in nylon or a media bag or something similar, and would fill that with carbon that I bought in bulk containers.

If you have trouble fitting a sponge, you might be able to strip one of the old cartridges and use the frame from it as something to embed the sponge inside of.
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