I thought that was my problem and it wasn't...I was very low and some minor and trace elements and that helped my issues...I also noticed what spills out tin is new plumbing idk if it's the pipe itself or the adhesiveI do not think it likely that tin at that level is causing apparent issue in a reef tank. it is impossible to say with certainty since ICP doesn't reveal what the chemical forms are, but generally speaking, folks with levels like that have not reported problems.