Question about bio-wheels...
So, I've never really had an aquarium with a bio-wheel before. I understand how it works but my question is, what is it supposed to look like once its cycled properly and has a culture growing on it. This tank has been running for four months now and the fins on the bio-wheel look just like they did when it was new. I would expect to see something growing on the fabric surface.
It spins pretty fast, is this preventing a proper culture from taking hold?
Thanks for any info.