NPK Question - The Planted Tank Forum
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post #1 of 2 (permalink) Old 05-13-2011, 04:28 PM Thread Starter
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NPK Question

Hi Everyone-
Might be a dumb question and if so, I apologize. I have a 75g well planted tank with DIY Co2 (2 1gal bottles ppm is 20-30), that I dose seachem flourish and excel too. I am pretty well stocked with decent sized fish (Rainbows, Giant Danio's, etc). I just recently started adding NPK as well. With all of these fish; aren't then producing enough N and P from eating and swimming? I'm not sure how much k comes from leftover food and fish waste. My Nitrate is usually at around 10ppm before my water changes
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post #2 of 2 (permalink) Old 05-14-2011, 03:58 AM
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It all depends on how much light you have, and how fast the light is driving the plants to grow. The faster the plants are trying to grow the more NPK and trace elements they need to be able to do so. With high light, for sure, fish waste is not enough. With low light it might be enough.

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