Just used this one on my hubby a few weeks ago when I "had" to purchase a de-nitrator:
"Honey, if I don't get this, I will be spending all of my time doing water changes and cleaning the tank! Our tank is an investment and it's worth the money to buy a de-nitrator to save the money invested in the tank."
I'm not sure he liked it...but he bought it! :-)
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If my tank is beautiful...life is beautiful!!
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