Silicone turning yellow

[Ryan115]

Recently I have noticed the silicone on the baffles in my sump is turning yellow.
I used GE Silicone I, which I have used many times before, but I have never had this happen before.
Tank cured for a few weeks before adding water.

Has anyone had this happen before? Any thoughts on what is causing this?

 

[nautical_nathaniel]

Have you been dosing anything to the tank that is sort of yellowish in color?

 

[Tom Blevins]

elos aminos?

 

[Ryan115]

elos aminos?

Nope, not dosing anything yet.
Tank has been going ~2 months now. Not something I am familiar with for new tank syndrome.

 

[Shon]

A highlighter is not a reef supplement.

I had this occur on a dry tank before, reptile cage. I thought it was from the 2 uvb 10's I was using. Although it was company made tank/their brand silicone (marineland/tetra). Be nice to know the actual cause. I hear rust (iron) in the water will do that to some bathroom chaulks.

.. Do you dose iron?

 

[Porpoise Hork]

Do you have anything that is made from neoprene in your system? If so there are pigments in it that can leech out and cause silicone to do this.

 

[Ryan115]

No neoprene, no iron dosing, no GFO, and as far as I know my daughters have not been trying to color the fish.
Though I did just find that my stainless temp probe was rusting a bit. Removed it and I will monitor the color.

 

[atp_08]

I know this is an old topic but I'm having the same issue. And I also used GE silicone 1. Did you ever find a fix for this issue?
I feel like it's something with the silicone. I had the same thing in a freshwater tank and it never went away. Yet thousands of people use GE so I feel like this would be a more wide spread issue If it were the silicone alone. My second thought is some type of fungus.

 

[ca1ore]

I have had this happen on a few occasions. Never seems to impact the system in any harmful way. I've not heard a cogent explanation for it either. I would not worry.