Could aluminum fixture bracket be causing stn on acros ?

[Flynsqwirl]

So been dealing with stn for a couple months now and all my parameters have seemed good and I've also had a reef store (sps dominate) check them with the same test results. Recently had a starbursts monti start to fade as well and am looking at my tank and thinking of this black Anodized aluminum light bracket hanging about a 1/2" in the water with the anodizing coming off and anyone think this could be a cause?

 

[chipmunkofdoom2]

It's possible, but in most of these cases, the problem ends up being nutrients (too high or too low) or instability of other parameters. What are your nitrates and phosphates? What have they been historically?

 

[BigJim]

Can you post some pictures and more information about your tank? It would be good to know the tank dimensions, tank age, lighting, filtration and the actual parameters. That might help someone spot an issue other than the metal.

I would still recommend an ICP test to check for metal in your water. I recently had and ATI ICP test completed and it showed high zinc. I have anodized aluminum DIY screen covers on my tank that occasionally get wet due to clumsiness on my part. I believe that is the likely source of the zinc, but it is too early to tell if that is the cause of my SPS issues. I removed them and will see what happens. Below is a link to an article about zinc and SPS corals.

https://www.advancedaquarist.com/blog/be-careful-with-zinc-levels-in-your-reef