Liquid hydroponics ferts in aquaria? - The Planted Tank Forum
 
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post #1 of 4 (permalink) Old 01-13-2016, 09:38 PM Thread Starter
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Liquid hydroponics ferts in aquaria?

Someone recently gifted me a box of General Hydroponics fertilizers when he was moving, but the only use I can think for them really is for my planted tank. There are a few different mixtures, so I was hoping maybe I could get feedback on which of these (if any) might be safe for use in the aquarium:

Armor Si:
  • Guaranteed analysis: 0-0-4
  • Derived from: Potassium Silicate
  • Also contains: 10% silicon dioxide

Liquid KoolBloom:
  • Guaranteed analysis: 0-10-10
  • Derived from: Magnesium Phosphate, Potassium Phosphate, Potassium Sulphate

FloraGro:
  • Guaranteed analysis: 2-1-6
  • Nitrogen breakdown: 0.25% Ammoniacal Nitrogen, 1.75% Nitrate Nitrogen
  • Water Soluble Magnesium: 0.5%
  • Derived from: Ammonium phosphate, magnesium carbonate, magnesium nitrate, magnesium sulfate, potassium carbonate, potassium nitrate, potassium phosphate, and potassium sulfate

FloraMicro:
  • Guaranteed analysis: 5-0-1
  • Nitrogen breakdown: 0.3% Ammoniacal Nitrogen, 4.7% Nitrate Nitrogen
  • Calcium: 5.0%
  • Boron: 0.01%
  • Cobalt: 0.0005%
  • Copper: 0.01% (0.01% chelated)
  • Iron: 0.1% (0.1% chelated)
  • Manganese: 0.05%
  • Molybdenum: 0.0008%
  • Zinc: 0.015% (0.15% chelated) (this looks like a typo on the label, not sure which number is right)
  • Derived from: Ammonium molybdate, ammonium nitrate, calcium carbonate, calcium nitrate, cobalt nitrate, copper EDTA, iron DTPA, iron EDDHA, iron EDTA, manganese EDTA, potassium borate, potassium nitrate, and zinc EDTA.

FloraBloom:
  • Guaranteed analysis: 0 - 5 - 4
  • Magnesium: 1.5%
  • Sulfur: 1.0%
  • Derived from: Magnesium carbonate, magnesium phosphate, magnesium sulfate, phosphoric acid, potassium carbonate, monopotassium phosphate, and potassium sulfate.


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post #2 of 4 (permalink) Old 01-14-2016, 04:50 AM
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Hydroponic fertilizers are designed for terrestrial plants, those with the folliage out in the air. Aquatic plants have somewhat different needs, so it is best to use a combination of chemicals that are recommended just for aquatic plants. See https://www.plantedtank.net/forums/15...7Cials%7C.html for a very good source.

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post #3 of 4 (permalink) Old 01-14-2016, 05:00 AM
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I see several problems with these.

I'll bet the first will grow diatoms!

The others have some ammonia sources for nitrogen. This might work in a plant-only tank, but not where there are fish, shrimp or other aquatic livestock.

I see several say they contain carbonates. This is not toxic, but it will raise the KH of the tank. If this is OK, then dose a small amount and see just what it does.

My overall concern is that all these are blended products. I prefer to get ferts that are closer to single ingredients so I can adjust the dosing of N, P, K, Fe, General Hardness and Carbonate Hardness separately.

In the interest of 'waste-not-want-not' it would be interesting to try these, but the first tests should be in tanks with no livestock.
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post #4 of 4 (permalink) Old 01-14-2016, 08:53 PM
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Quote:
Originally Posted by winn View Post
Armor Si:
  • Guaranteed analysis: 0-0-4
  • Derived from: Potassium Silicate
  • Also contains: 10% silicon dioxide


My only understanding of silicate is that is causes diatoms.


Quote:
Originally Posted by winn View Post
Liquid KoolBloom:
  • Guaranteed analysis: 0-10-10
  • Derived from: Magnesium Phosphate, Potassium Phosphate, Potassium Sulphate
FloraBloom:
  • Guaranteed analysis: 0 - 5 - 4
  • Magnesium: 1.5%
  • Sulfur: 1.0%
  • Derived from: Magnesium carbonate, magnesium phosphate, magnesium sulfate, phosphoric acid, potassium carbonate, monopotassium phosphate, and potassium sulfate.
Both fine.



Quote:
Originally Posted by winn View Post
FloraGro:
  • Guaranteed analysis: 2-1-6
  • Nitrogen breakdown: 0.25% Ammoniacal Nitrogen, 1.75% Nitrate Nitrogen
  • Water Soluble Magnesium: 0.5%
  • Derived from: Ammonium phosphate, magnesium carbonate, magnesium nitrate, magnesium sulfate, potassium carbonate, potassium nitrate, potassium phosphate, and potassium sulfate

FloraMicro:
  • Guaranteed analysis: 5-0-1
  • Nitrogen breakdown: 0.3% Ammoniacal Nitrogen, 4.7% Nitrate Nitrogen
  • Calcium: 5.0%
  • Boron: 0.01%
  • Cobalt: 0.0005%
  • Copper: 0.01% (0.01% chelated)
  • Iron: 0.1% (0.1% chelated)
  • Manganese: 0.05%
  • Molybdenum: 0.0008%
  • Zinc: 0.015% (0.15% chelated) (this looks like a typo on the label, not sure which number is right)
  • Derived from: Ammonium molybdate, ammonium nitrate, calcium carbonate, calcium nitrate, cobalt nitrate, copper EDTA, iron DTPA, iron EDDHA, iron EDTA, manganese EDTA, potassium borate, potassium nitrate, and zinc EDTA.
Don't consider using these in an aquarium with fish unless pH < 6.5.

Feel free to edit.
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