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Thanks for the insights guys. I did use the media from the previous filter albeit the previous filter was out of action for a couple of days before I was able to get a new one, so I’d assume that any bacteria on the old media would have died by that stage?

I have 3 tiger barbs which I’ve had for a number of years, however, in the last month or so 2 of the have started developing dark black blotches. Could these be caused due to changing an external canister filter at about the same time, and is it treatable?