Okay after reading all the information I can find online and on this forum, I am 95% convinced to get a UV
steriliser. I have only one question...
I now believe that a lot of oxidising bacteria lives on the rock and I could even run an aquarium without bioballs, etc in the filter, but my question is about free floating bacteria.
Does the 'good' bacteria actually live on the rocks and other objects or does it float around? Also the filter is not exactly a huge source of 'good' bacteria, correct in that not a lot comes out of it, rather the bacteria lives in it?
If that's so, there's no problem running the UV
in line with the filter's line that goes back into the aquarium, correct?