all Zero
I have a 22.2 gL Tank with a bristlenose and 3 tetras using an eheim 2236 so turning over more than enough,
also with live plants.
Im also do 25% water change every week without fail.
the problem is I have never got rid of it for it not to come back and I believe its a bacteria not fungul so I have been possibly treating it wrong.
Its not cottony more like a white filmy line it's hard to describe.
I have seen it hanging off and almost gone but regrows back Argh