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post #1 of 6 (permalink) Old 02-11-2010, 11:38 AM Thread Starter
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Copper in fertiliser

I have set up my first live plant tank and purchased some ‘all in one’ liquid aquarium plant fertiliser. It contains chelated iron, potassium, magnesium, manganese, boron, copper, zinc, molybdenum and sulphur.NO PHOSPHATE! NO NITRATES!
My question is, I have read copper is harmful to fish, as this fertiliser contains copper should I use it? Also are the contents truly complete or will I also need to add something else?
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post #2 of 6 (permalink) Old 02-11-2010, 12:47 PM
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This liquid fertilizer you have purchased is a micronutrient mix only. It does not contain macronutrients (NPK) that is required by plants as well.

Copper can be toxic in high amounts but is an essential micronutrient, so its presence in your fertilizer would not worry me.

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post #3 of 6 (permalink) Old 02-11-2010, 04:45 PM
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Ditto: The small amount you dose is not enough potassium, so you will need to add more K, and is a low level of copper. Unless you already have high copper in your water source or substrate, the amount in the fertilizer is just right.

Yes, look into fertilizers that will add nitrogen, phosphates and potassium to the tank. Plants use more of these than the micros. All are required. But you may or may not need to add different amounts of each depending on your system.
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post #4 of 6 (permalink) Old 02-11-2010, 05:22 PM Thread Starter
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Thank you for the good advice, as yet I do not have the understanding or experience to confidently dose different ratios of NPK. Is there a commercial all in one macronutrient product that is balanced for easy use for a newbie like me?
I also live in a very hard water area so have purchased a RO unit which is producing water at a PH of 6.4, should I be also adding minerals back to this RO water?
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post #5 of 6 (permalink) Old 02-11-2010, 11:27 PM
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Unfortunately, I do not think there is an all in one macronutrient mix. Even the Seachem line separates out its macronutrients.

However, if you do a bit of reading, I would suggest you go with dry chemical dosing instead; in the long run, it will be much cheaper.

You should not be using pure RO water when doing water changes. As you have already guessed, plants and fish require minerals, so stripping virtually of them (via RO) will deprive them of need nutrients. As such, you should try mixing RO water with varying amounts of tap water to attain the levels you want to achieve.

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post #6 of 6 (permalink) Old 02-13-2010, 12:41 PM Thread Starter
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I have now obtained a dry mix, does it include all that is needed, this is the analysis:

B - 0,188 Mn - 0,718 Zn - 0,189 Cu - 0,163 Fe - 1,174 Mo - 0,024 Co - 0,004
O - 35 N - 6 Mg - 10 S - 14 C – 5 H2O - 27,5 = 99.96 %, altogether 60g
+ 30g K2SO4 (Potassium Sulphate) + 15g Fe (8% iron chelate EDTA).
The instructions are to mix all together with I litre of RO water, and dose at the rate of
5ml per 50 litres of water weekly.
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