Filter smells bad!

[Ryan Young]

Hi all, finally got round to cleaning my filters on my tank after, frankly, neglecting it for a long period due to personal circumstances. On my larger tank I have two filters running, the second was added about 2/3 months ago.
It is only the new filter that smells but it is like an eggy smell and have had the filter off for a week which might be a reason why... not sure but other than that I am not sure what it could be and if it is ok to carry on using it in my tank once clean.
Thanks Ryan

 

[Manisha]

A rotten egg smell is a sign of a sulphur containing compound like sulphur dioxide gas but in a fish tank anaerobic areas in a substrate can lead to hydrogen sulphide being produced. I think if you have had your filter off and there hasn't been airflow this is likely to be what is being produced to cause this smell.

 

[Ryan Young]

Okay cheers, just gave it a thorough clean and is all good now