mercury

I'm new to the hobby and have been looking for salt mixes. I was looking at Tropic Marin's website and in their salt ingredients they put Mercury as one of the trace elements. I'm a bit confused. Is there a use for mercury by aquarium inhabitants? Also is this alright or would the mercury...

I received my first Triton test on a 9 month old Red Sea 170 mixed reef. Using Red Sea reef salt and Aquaforest Comp 123 for Ca, Alk and Mg. Test results showed everything in the green except for really high chromium and mercury. Searching for any metal contacting water in my tank I found...