Nutrient Levels - The Planted Tank Forum
 
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post #1 of 8 (permalink) Old 03-21-2005, 02:29 PM Thread Starter
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Nutrient Levels

Hello,

Well i'm working upon my planted tank again and trying to get the plants back up to optimal health. I have 34gallons, 3 x 20watt T12 tubes and CO2 at 20ppm - its very bright now...even a little washed out.

anyway i dose KNO3 to keep 5-10ppm more towards 10ppm and 5 being the lowest i'll ever let it get and I dose Tropica Master Grow which is heavy in K (potassium?)

My tap water is very hard so i dont think i need to dose micro's but i have Flourish if you think i should.

My question is I think i read that you should dose ferts according to your iron reading i.e if no iron is there the rest wont be? Well I'm dosing the recommend dose of TMG split in half once a week, half on saturday and half on wednesday.

But when i test for iron i get nothing??????

I know my iron test kit works because i replaced the subsrate about 5months ago and i have a several algae break outs and my iron levels went through the roof!

so should i add iron seperately like i did last night, here is my proposal:

Check KNO3 and dose accordily

Check PO4 which is currently at .5ppm

check IRON and dose to keep at 1ppm?

dose TMG as per above

Or should i dose TMG at full strength whenever my iron reading is 0ppm
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post #2 of 8 (permalink) Old 03-21-2005, 04:47 PM
 
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Check KNO3 and dose accordily - yes

Check PO4 which is currently at .5ppm - yes, don't exceed 1.0ppm

check IRON and dose to keep at 1ppm? - No. Iron test kits are never reliable. We want about 0.3ppm of iron at most. Best to dose some iron 3 times per week.

dose TMG as per above - it's probably not as high in potassium as you'd think. I dose potassium from dry Potassium Sulfate, to 15ppm after a water change.
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post #3 of 8 (permalink) Old 03-21-2005, 09:50 PM Thread Starter
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ok i can dose the iron accordingly...i think it says .1ppm not 1ppm anyway.

if the test isnt that reliable then how can i tell if i'm over dosing???

TMG has 0.79% potassium and 0.07% iron.

so can i assume the amount of iron isnt worth considering?

I add KNO3 plus TMG so theres potassium in both but i havent a test kit to test for K...

what will i notice if i over dose?

thanks.
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post #4 of 8 (permalink) Old 03-22-2005, 10:01 PM
 
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Nothing. Too much potassium will not cause algae. Too much iron will not cause algae.
Too much potassium could inhibit calcium uptake, which is characterized by curled leaves on new growth.
However if you do a 50% water change weekly, followed by a 15ppm dose of potassium, you'll be fine. I don't know anyone who owns a potassium test kit.
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post #5 of 8 (permalink) Old 03-22-2005, 10:20 PM
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Should I dose iron with macros or with micros?

40 gallon SeaClear Acrylic, 192 watt Orbit Lunar PC, Filstar XP2, Filstar XP1, JBJ Regulator, Rhinox 5000 glass co2 diffusor, 9 watt UV sterilizer, Hydor Inline Heater, Pool Filter Sand substrate
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How comes shoppings so stupid, looks at all this stuff I haves, what do I do's with it.
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post #6 of 8 (permalink) Old 03-22-2005, 11:35 PM
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Quote:
Originally Posted by Anthony
Should I dose iron with macros or with micros?
micros. It might react with macros if dosed with macros.


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post #7 of 8 (permalink) Old 03-23-2005, 01:50 PM
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Also Iron has to be really high before it will bother the fish and I don't think the plants would mind it if the water was saturated with iron.
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post #8 of 8 (permalink) Old 03-23-2005, 05:33 PM
 
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don't mix iron with phosphate...they'll form an insoluble molecule, which means neither fert will make it to your plants.
I tend to alternate dosing my trace mix (plantex CSM+B) on one day, and then iron the next day. Macros I dose after a water change, and sometimes mid-week if my levels are dipping too low.

super high iron levels can cause sterility in live bearers, but that's about it.
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