so if you have a carbon filter and your tank is not cycled yet, do you just change it as needed? The directions that came with my Tetra Whisper Filter said to change the filter when water actively flowed over the top of the cartridge or about once a month. Well, it's been longer than a month and water as yet to flow over the top of the cartridge, although it is getting close, but my tank is not cycled (I've been testing it weekly for 2 months now, and still not cycled). So.... what do I do? Do I just swish it out, or do I change it completely?