Hydroponics Fertilizier - The Planted Tank Forum
 
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post #1 of 7 (permalink) Old 07-29-2020, 07:23 PM Thread Starter
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Hydroponics Fertilizier

Hello:

I have a small amount of general hydroponics fertilizer (Flora-micro) left over. This typically comes in 3 bottles and you mix all three depending on the growth cycle of plants. Now looking at one of the bottles is there any reason why I couldn't experiment with using a small amount to provide some nitrogen/potassium and trace elements. I know the general rule of thumb is NO to plant fertilizers, but thought perhaps this may be worth trying. No phosphates that I can see.
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post #2 of 7 (permalink) Old 07-29-2020, 08:08 PM
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It contains some nitrogen in the form of ammonium, so at the least you would need to monitor your ammonia level to prevent any issues there. Some fish species are very sensitive to ammonia.
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post #3 of 7 (permalink) Old 07-29-2020, 08:12 PM Thread Starter
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Correct it does, which one would need to keep an eye on. Only thing I am stuck on is say I wanted to add 10ppm of total nitrogen to say 100 litres how much would I need?. If a fair bit then it may also increase the general hardness as 5% of the solution is calcium?

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post #4 of 7 (permalink) Old 07-29-2020, 08:26 PM
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The label lists each by weight %. It has 5.0% nitrogen, which means 50 grams of nitrogen dissolved in 1 liter (=1,000 grams) of solution.

If you want 10 ppm nitrogen (= 10 mg /liter) in 100 liters, you need to add a total of 1,000 mg of nitrogen.

Using your fertilizer, you would need to add 0.02 liters ( = 20 ml ) to get 1,000 mg of nitrogen.

Somebody, please double-check my calculations.
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post #5 of 7 (permalink) Old 07-29-2020, 08:39 PM Thread Starter
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Thank you. Would that also give me a increase of 10ppm of calcium as well?

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post #6 of 7 (permalink) Old 07-29-2020, 08:44 PM
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Yes. Also, it would add 0.6 ppm ammonium.
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post #7 of 7 (permalink) Old 07-29-2020, 09:40 PM Thread Starter
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Which is probably ok if the ph is low, would assume the plants would consume it rather quickly. I have few fish. Well, time to experiment, perhaps only raise to 5ppm

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