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changing filter

  1. Betta Fish Care
    Hi, all. I have a Tetra Whisper 3i (Bio-Bag) filter, and I am not sure how to go about changing it. I have a few questions! :) 1. Do I keep the fish in the tank while changing the filter? 2. Do I insert a completely new cartridge or do I re-use the old one (and if I re-use the old one, do I...
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