The Planted Tank Forum - View Single Post - Need advice - algae and nitrate problem in planted tank
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post #23 of (permalink) Old 01-05-2013, 07:00 PM Thread Starter
Planted Tank Obsessed
Join Date: Aug 2011
Location: Northwest Kansas
Posts: 307
Originally Posted by wkndracer View Post
Testing Your Nitrate Test Kit

  • Take 1000ml of water. Dissolve 6.5 grams of KNO3 in it.
  • Take 1 gallon of water. Each ml of the above solution will add 1 ppm of NO3.
  • Add 5 ml, test. Your test kit should show 5 ppm.
  • Add 5 more ml, test. Your test kit should show 10 ppm
  • Repeat through the range of your test kit.
  • (Thanks Rex )

edit: split photo periods are no problem at all so I would forget that being a possible problem (done it for years here)

Plants can't use nitrates without phosphate though and as I posted low phosphate levels cause me algae issues.
What is KN03 and where do I find it?

How do I tell if my phosphates are low? I don't think I can test for that with my API test kit. If they are low, how do I fix it?
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