Questions About Fertilizers - The Planted Tank Forum
 
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post #1 of 4 (permalink) Old 09-06-2012, 11:56 PM Thread Starter
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Questions About Fertilizers

I have a few questions. First, I have a piranha tank that has a lot of fish waste. I have had a big problem with algae. I'm trying to reduce lighting and make more frequent water changes. I add API Leaf Zone once every two weeks and API CO2 Booster every day (at twice the dose). The plants (Amazon Swords) do poorly, but the algae thrives...My question is, am I lacking some trace element or nutrient? Should I be adding fertilizer at all due to the excess amount of fish waste? Or would the extra Iron and Potassium only encourage algae growth?
I am also trying to lower Ph as it is 8.0 (I'm trying to get Kh down first). Gh is 6 and temp. is 76-78.

Secondly, I have a planted shrimp tank and I am wondering if there are any fertilizers out there that contain more than Iron and Potassium, but do not contain Copper? I assume the API Leaf Zone isn't enough as far as supplying all the necessary things...again, do I even need fertilizers if I have fish/shrimp?
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post #2 of 4 (permalink) Old 09-07-2012, 03:13 AM
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Fish food (and shrimp food) contain varying amounts of nutrients for the plants.
In general high protein foods (Piranha food) will have high nitrogen, high phosphate, moderate to low potassium and a reasonable amount of trace minerals, including some iron, but maybe not enough iron.

Plant based foods are lower in protein, so lower in nitrogen, but not too bad for the other nutrients.

When I had heavily stocked tanks I only had to dose carbon, potassium and iron, and I used Leaf Zone and Excel. I was basing the dosing on the nitrate level. As long as I had to do water changes to keep the nitrate low, I knew the plants did not need more nitrogen. Since plants use a low level of phosphate, I assumed that was OK, too.

You could try putting some slow release tablets under the substrate where the roots of the Amazon Sword can find it. They are very heavy feeders.
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post #3 of 4 (permalink) Old 09-07-2012, 03:41 PM Thread Starter
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Well the presence of algae means that I have too many nutrients, right? So should I even use fertilizers?
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post #4 of 4 (permalink) Old 09-07-2012, 03:45 PM
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Quote:
Originally Posted by crypticmonk View Post
Well the presence of algae means that I have too many nutrients, right? So should I even use fertilizers?
No. It means you have too much light therefore you need co2. As a simpler answer.

Either you lower the light intensity/time or inject co2.

Make sure you understand Liebig's law of the minimum.


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A heavily planted shrimp tank is possible!
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