metals in tank

Hi, I have a 32.5g Fluval reef tank. It has been up and running for a little over a year. I ironically had a lot of success with inverts during the first 6-9 months of my reef tank. I had a serpent star, Cleaner Shrimp, and Peppermint Shrimp. I had to rehome the Serpent Star since it was too big...

My MP40 wet side has cracked and the magnets completely rusted... it is several years old and worked flawslessly, but still shouldn't fail like this. I have had a few ICP results showing high metals and couldn't see anything obvious, I changed cabinet hinges etc and eventually after a few months...