Potassium Dosing: Should I?
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Old 09-06-2003, 09:41 PM   #1
mattrmiller
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OK, I have algae problems. I have narrowed it down to high phosphates. I have phos-zorb in my filter, and it has only slowed it but not enough. I am thinking about dosing potassium, because I heard that it will make my plants use up phosphates faster.

What should I do?
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Old 09-07-2003, 03:06 AM   #2
Wasserpest
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I would... it's balance that you want to achieve. So if you have high PO4 but no K, IMO thats worse than having high PO4 and sufficient levels of other macros.

A level of 20 ppm is recommended, and you can figure out how much K2SO4 or KCl you need to add with Chuck's calculator http://www.csd.net/~cgadd/aqua/art_p...osage_calc.htm

If you are concerned with overdosing, just half the amounts. A little less than optimum is still much better than zero.
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Old 09-07-2003, 06:01 AM   #3
mattrmiller
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Thank you for your wonderful input. How do you recommend dosing potassium? What do you use. I have also read that CO2 will help stimulate plant growth. I notice you have a DIY CO2 setup. How did you achieve this? Sorry for all of the questions, but I really appreciate your knowledge.
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Old 09-07-2003, 08:58 PM   #4
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The answer to pottasium dosing is almost always yes. If you're not dosing pottasium there's probably none in your tank. Unlike other nutrients like N and P, potassium doesn't get introduced from food or fish sources.

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Old 09-08-2003, 05:46 PM   #5
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Quote:
Originally Posted by mattrmiller
How do you recommend dosing potassium? What do you use. I have also read that CO2 will help stimulate plant growth. I notice you have a DIY CO2 setup. How did you achieve this? Sorry for all of the questions, but I really appreciate your knowledge.
Personally I dose 1 tsp of K2SO4 with every weekly 15% water change. But... as it has been said before, what works for one might not work for another, and I might change what I am doing next week just need to add this disclaimer to not get slapped around too hard.

I got the K2SO4 from someone mixing fertilizers, but do a search on this board to get some other possible sources.

Regarding my CO2, I am using two three liter soda bottles, and dissolving 100% of it leads to good CO2 levels (tapwater ph=7.6, tank water 7.0). Here is a good reference for DIY setups: http://www.corydorasworld.com/jlv.htm
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Old 09-08-2003, 07:39 PM   #6
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One source of potasium is potasium chloride. This can easily be obtained from the grocery store as "No Salt" brand salt substitute.
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