What is the minimum temperature that a biofilter needs to maintain its healthy bacteria?
Don't know from experience as I've never had any reason to use it in coldwater yet. However what JKB says sounds right to me from literature I've read.
That said even if your bacteria is healthy in cold water, albeit working at a reduced rate, I would stil think you may have fungal issues with your readears if you keep the water cold.
As you know centrarchids in general have fungal issues if held in cold water facilities too long with lower corressponding feeding and a reduced immune response.
