My tank sporadically smells like creosote!

[Aquariumaddictuk]

I'm hoping this isn't the weirdest thread title ever on r2r!

I'm noticing a very strong scent of creosote or similar from my reef.
It's sporadic e.g once a week perhaps.
Overwhelmingly strong then it clears!
My wife has confirmed
It's truly strange.
Water is crystal clear, carbon in situ.
Barebottom tank that I keep OCD clean.
I'm absolutely stumped.

Is some kind of odd chemical reaction happening?

 

[Reefing_addiction]

Bump

 

[PharmrJohn]

I'm hoping this isn't the weirdest thread title ever on r2r!

I'm noticing a very strong scent of creosote or similar from my reef.
It's sporadic e.g once a week perhaps.
Overwhelmingly strong then it clears!
My wife has confirmed
It's truly strange.
Water is crystal clear, carbon in situ.
Barebottom tank that I keep OCD clean.
I'm absolutely stumped.

Is some kind of odd chemical reaction happening?

I see Chemical Reaction and I think of @Randy Holmes-Farley. Thoughts?

 

[PapaFishRocks]

Any chance you use Seachem Prime?

 

[Aquariumaddictuk]

Any chance you use Seachem Prime?

No, not even in my freshwater tank which is in same room.
I Only use RODI in both.
It's not that sulphur smell you get with prime it's very distinctive.