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The levels in my piranha tank are too high, I'm doing a water change tonight.

But you know how messy piranhas are, so nitrate levels are a big problem. I have a few plants in there and want to feed them but all aquatic fertilizers have nitrogen in them; or do they? Can I use aquatic plant food or not? Or is there a nitrogen-less food out there?
 

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So if nitrate (NO3) level is the problem, you have two ways to solve it, together or even separately.
Denitrification works in sewage treatment plants only, not in aquarium scale.

1) Water changes; and or
2) Big amount of fast growing plants under high lighting and CO2-system.

Harry
 
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