I wouldn't assume a polyfilter will bind appreciable phosphate from seawater. Also, while I too would be concerned with too much soluble iron (although I also intentionally add it too), the red pad may just be collecting very fine particles of GFO that got loose and stuck in the pad, rather than binding true dissolved iron. That concerns me less than too much soluble metal.
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Randy Holmes-Farley
Current Tank Info: 120 mixed reef
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