The Planted Tank Forum - View Single Post - fertilizer options
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Old 01-20-2013, 07:42 PM   #2
Wasserpest
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To reach a specific concentration of fertilizers, you will need to consider the total water volume (180 gal).

Since the fertilizer dissolves in the tank water, it makes no difference if you dissolve it first in water or not. It will last exactly the same time. Unless I misunderstand your question.
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