Does anyone know what this is?

[Dww-law]

I found this stuff growing in my FX5 filter. Any clue what it is?

[Azndrift06]

found the same thing on my FX5. is this bad for the fish? how can i cure this?

[Mastiffman]

I've only ever seen that stuff in and on equipment where NLS was fed regularly.

[Azndrift06]

Originally Posted by Mastiffman

I've only ever seen that stuff in and on equipment where NLS was fed regularly.

Thanks.... Yes that's the brand I used to feed my petro.

[Mastiffman]

Originally Posted by Azndrift06

Thanks.... Yes that's the brand I used to feed my petro.

Definitely seems like the case then.