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Hello, this is cross posted from a different forum, but I feel like I need some help fairly quickly, so I'm posting here too! If you're curious about our back-story, you can read it here: http://######### A very helpful member clued me in to the fact that there are different kinds of cartridges for my in-tank filters: carbon or bio. I have no idea what I have, and I'm having trouble finding enough info online to help me figure it out (even having visited the manufacturer's website!) I feel like I really need to know, because we're finishing up a fungus treatment, so I have the filters out thinking they were carbon. But if there's a chance they are bio-filters, I understand I should have them back in the tank? *Added complication* my tank is not yet cycled! I think I may actually have 2 bio-filters, but I am not sure. Nowhere on the packaging can I find it specified as bio, but they both look the same, with a blue clip across the top. They are different from what I bought to have on hand as replacements, which do specify carbon and have no clip. So in that case, I should definitely put them back in even while treating, correct? Side question - then after this is all over, would I be using the carbon ones in there with the bio, instead of, or a bio in one and carbon in the other filter? I'm attaching pictures of: the box one of the filters came in the cartridge that came with that filter next to the box of carbon filters I have not opened yet and the cartridge with the blue clip held up to the light trying to show how it's made. Thanks for any help you can provide!