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I purchased a Seachem calcium test a few months ago and can't seem to get it to test right.I even used there sample test water and up with the same results 900mg/l now if this test was right I don't think my corals would be happy but there fine.So has anybody had the same problem as me with...

I agree with most of rocks suggestions ecept for one the sand sifting starfish they are not safe if you have live sand and with out live sand they starve and die.