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So I do recommend doing regular ICP testing. This is a tool that wasn't around years ago... and can certainly help you stave off many disasters. Recently one of my icp tests came back with some heavy metals on one of my tanks. This indicated a magnet was the likely culprit and sure enough the water proof magnet that held my ato line in place had somehow corroded through its casing. I actually forgot that the ato on that tank was held in place with a magnet that came with the kit and prolly wouldn't have caught this till disaster had taken a full hold on some of the corals. No, I don't own stock in any particular ICP testing company...