Hi, my Crescent 5gal came with a Tetra Whisper filter and overall I am very happy with it. My question is about the replacement cartridges. I haven't changed mine out yet, just swishing it in old tank water during water changes. But now it's on it's last leg, pretty much about to fall into pieces.
What options do I have to replace it? I see the biobag replacements but it has carbon and I don't need the carbon. I understand I can just dump it, but that seems to be wasteful to me and I don't want to have to pay just to toss it.
Is there another one that fits in there that doesn't come w/ carbon? Something cheaper would be great, too.
How do I go about replacing the cartridge w/out losing the bacteria and going into a mini cycle?