Mould in bathroom extractor fan flexi ducting

[emmaamme]

I recently had my axial bathroom extractor fan replaced by an electrician but the flexi hose ducting wasn't replaced at the time (it's 6 years old).
I've noticed it has black mould inside the ducting and just wondering if I should replace it myself? Other than the mould it's in good condition and is probably about 1.5 metres long in total.
I'm guessing all flexi ducting is susceptible to mould inside it and would rather not have to replace it if it's not going to be an issue. Could I just leave it until my new fan eventually needs replaced?

 

[foxhole]

Should be ok now you have a working fan.

 

[emmaamme]

Thanks - I think it's just a build up of mould over the last 6 years since the house was built as the fan was replaced straight away after the old one conked out

 

[Burnerman]

Allow the fan to run for a good while after showering, Emma - I have mine set to around 25 minutes.
The mound will be historic and shouldn’t get worse now, but I doubt if it will ever vanish!
Regards
John

 

[emmaamme]

Thanks John, I appreciate your response (as always!). I've got the fan set to run for an additional 20 mins so that sounds perfect. I really didn't fancy trying to change the ducting myself. Hope you're all good and thanks again