Two Little Fishies MetaSorb UHC Metals Adsorbing polymer SmHeavy Metal Thunder? An excess of heavy metals in the water is toxic to aquatic life. These metals may come from the water source, from foods, from artificial seawater mixes, corroding metal equipment, magnets, pumps, etc. Sudden mysterious ailments in fishes, corals and other invertebrates may occur when heavy metals reach a toxic threshold. MetaSorbTM UHC is made with patented polymers developed for the US Environmental Protection Agencys Superfund