nickel

Can Sulphur pearls contain Nickel? I received my latest ICP with Ni at 26ug/l , it was previously at 0ug/l. The only changes I can think that I made on the tank was to run a sulphur reactor for a few weeks to reduce nitrates. It is no longer in the tank as nitrates did reduce.

So I got my ATI water results back and Zinc, Nickel, and Iron were high. Went looking at MP40s and found one to have a small amount around the end of the shaft, so I felt pretty good about finding the issue. While cleaning the sump out today as the detritus was building in the refuge section...