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Nickel needs of plants



The reason nickel just recently made the list of required plant nutrients is that it is *very difficult* to grow nickel deficient plants.  Nickel is truly a trace mineral, and even most types of purified water contain enough contaminating nickel to supply those needs.  As Neil mentioned, urease is not frequently needed by plants, and primarily needed by germinating seeds.  If you are using tap water I will gaurantee that you have enough nickel for any aquarium plant and don't need to supplement it.  Same for cobalt.

BW