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post #1 of 7 (permalink) Old 08-15-2011, 01:09 AM Thread Starter
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Question about ferts

Hi, I have a 70 G planted tank, with a substrat that's clay and a bit of earthworm humus, capped by gravel.

I dose once in a while whatever liquid fertilizer i could find here in Venezuela, most Hagen, which most people have told me it's crap.

A few weeks ago i found Sera Florena. I also dose Seachem Excel.

The plants i have are: Vallisneria, Limnophila sessiliflora, Higrophylla difformis, H. polysperma, S.subulata, M.pteropus, Cryptocorine species. and Rotala rotundifolia.

They do ok, my lighting is 2 T 12 tubes, 40 watts each. 2 T8 tubes, 32 watts each, and 2 compact flourescent each one is 20 watts.

So i guess i am around 2.5 wpg.

Anyways, today i found and inmediatly bought a bottle of Seachem Iron. They also have Potassium...

Should i get Potassium as well??

Will my plants do ok with only Fe iron? I know the ideal would be to have them all, but if you could only get one, which one will you choose??
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post #2 of 7 (permalink) Old 08-15-2011, 01:25 AM
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potassium is a macro nutrients meaning that plants use it in a larger quantity and Iron is a micro nutrient meaning plants need less of this, however both are important for normal plant development.


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post #3 of 7 (permalink) Old 08-15-2011, 02:04 AM
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Quote:
Originally Posted by Eddie80 View Post
but if you could only get one, which one will you choose??
Unless you naturally have a huge nutrient imbalance, getting only one won't be any better than getting none. Let me use this extreme example: Imagine you, as a person, need two nutients to live: food and water. Now you say, "if you could only get one, which one will you choose?" Well it doesn't matter, you will still die shortly whether you choose food or you choose water. You need both to thrive. Your plant growth will always be restricted by your least available nutrient, and you can't make that better by providing more of the others.

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post #4 of 7 (permalink) Old 08-15-2011, 08:46 AM Thread Starter
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Hmm good point. Hope that when i get back they'll still have potassium... Thank you
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post #5 of 7 (permalink) Old 08-16-2011, 04:21 AM
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Hmm good point. Hope that when i get back they'll still have potassium... Thank you
Just fyi, potassium and iron aren't the only things you should be dosing unless you have a heavy fish load and plants can get their nitrates and phosphates from that. The three macro nutrients of plants are NPK, meaning nitrogen, phosphorus, and potassium. Then, for micronutrients, there are trace elements. Flourish makes one fert for each of these, but really if you have a low light tank you can just buy some flourish comprehensive and go with that, as that should likely be enough. You can also look into dry ferts if you'd like.

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post #6 of 7 (permalink) Old 08-16-2011, 05:22 AM
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You did not mention if you had co2 injected into the tank or not. It is not normally important to dose the Macro ferts (Nitrogen/Potassium/Phosphates) unless you are using co2 on the tank. The reasoning behind this is that in a setup without it the plants don't use up nutrients as fast and when you do your normal water changes the nutrients in the water satisfy the needs of the plants.

If you don't have co2 I would say that only a comprehensive Micro fert would be helpful. You also have a semi nutritious substrate and if you added some sort of root fertilizer that would help satisfy the needs of the plants too.


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post #7 of 7 (permalink) Old 08-17-2011, 09:11 AM Thread Starter
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No CO2 except for Excel.

I do have nutritious substrate though.

Dry ferts are out of the question as they are not available here
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