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Re: "Iron Green"?

>     Total Nitrogen: 8% (Urea Nitrogen)

NO! Don't use it.  Urea is essentially ammonia.  I experimented with 
a hydroponics fertilizer that contained urea, and a very small amount
of the stuff spiked the ammonia off the test-kit chart.   I experiemented
with it in a plant-only tank.  

Chuck Gadd