ferts without CO2? - The Planted Tank Forum
 
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post #1 of 8 (permalink) Old 01-12-2010, 04:02 PM Thread Starter
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ferts without CO2?

In a low tech tank with no CO2 and low-medium light and low-medium light plants would there be any need for ferts?

I had done some EI dosing with Seachem liquid ferts for a while--didnt notice any huge difference in plant growth, did notice some dead Corydoras and a decrease in my bank account though. Someone with far more tank experience than I suggested that I could be poisoning the fish and plants with the dosing if it werent being used by the plants. Low light and no CO2 would mean low growth rates and slow uptake of ferts, so he surmised that I could be overloading the tank with ferts for no reason.

50% weekly water changes and daily doses of Excel and weekly doses of Flourish Comprehensive is my current strategy--just curious of other thoughts.

Thanks in advance.
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post #2 of 8 (permalink) Old 01-12-2010, 04:11 PM
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That should work fine, low-light tanks will use ferts just like high-light but in much lower amounts. I dose my low-light tanks with GH Booster after each WC (a tad per 10gal) and get very good results.

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post #3 of 8 (permalink) Old 01-14-2010, 04:02 AM
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In low light tanks (about 1 wpg), with tap water I found they did better when I dosed potassium and iron. I used Excel for carbon. Fish food supplied all the rest.
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post #4 of 8 (permalink) Old 01-14-2010, 04:02 PM
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Your fish did not die from fertilizer poisoning. Levels have to be extremely high before you would have any problem. Seachem liquid ferts are not very strong, most of what you are paying for is water, making it even more unlikely that they had anything to do with your corys dying. I can totally relate to the fact that what you mainly experienced was a drain on your wallet. That is why a lot of people opt to use dry powdered ferts, they are extremely inexpensive compared to any of the pre-mixed liquid ferts sold for aquarium use.

I dose dry ferts in very small quantities in my low light tank. Diana's suggestion sounds like a good place for you to start. If you have enough fish in the tank and are feeding them well you probably are getting enough nitrates and phosphates from fish food, it is easy to be shy on potassium. Flourish Comprehensive contains mainly micro nutrients including Fe but some plants like more Fe than Flourish supplies.
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post #5 of 8 (permalink) Old 01-14-2010, 05:57 PM
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In many tanks with low light and no CO2, the fish provide more than enough nutrients for the plants.

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post #6 of 8 (permalink) Old 01-16-2010, 05:05 AM
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Quote:
Originally Posted by captain_bu View Post
Your fish did not die from fertilizer poisoning. Levels have to be extremely high before you would have any problem. Seachem liquid ferts are not very strong, most of what you are paying for is water, making it even more unlikely that they had anything to do with your corys dying. I can totally relate to the fact that what you mainly experienced was a drain on your wallet. That is why a lot of people opt to use dry powdered ferts, they are extremely inexpensive compared to any of the pre-mixed liquid ferts sold for aquarium use.

I dose dry ferts in very small quantities in my low light tank. Diana's suggestion sounds like a good place for you to start. If you have enough fish in the tank and are feeding them well you probably are getting enough nitrates and phosphates from fish food, it is easy to be shy on potassium. Flourish Comprehensive contains mainly micro nutrients including Fe but some plants like more Fe than Flourish supplies.
What powdered ferts do you use? How do you go about dosing them...
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post #7 of 8 (permalink) Old 01-16-2010, 11:47 AM
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Re;

Both of my 55gal. tanks are low-tech. About 1.5 WPG;no Co2; and I use Seachem Flourish per mfg.dosing. Now, my plants arent growing out of the tank,but they are lookin good(especially since I got bck to weekly water changes!!) I have swords, dwarf rotalla java moss, some hygros, and a couple anubius nana,and a bunch of crypts-and they al look gerat!!
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post #8 of 8 (permalink) Old 01-16-2010, 05:15 PM
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Quote:
Originally Posted by devadair View Post
What powdered ferts do you use? How do you go about dosing them...
I get my dry ferts here

http://www.aquariumfertilizer.com/

Suggest your read through the dosing regimes sticky at the top of this forum.
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