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...