Hi phosphates. What to do? - The Planted Tank Forum
 
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post #1 of 6 (permalink) Old 11-23-2008, 01:58 AM Thread Starter
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Hi phosphates. What to do?

Here's the problem. My phosphates in my planted 75 gallon are off the charts. I have tested my self and had the lfs test and they have both been through the roof. My question is how to lower them because the algae is getting out of control. thanks!
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post #2 of 6 (permalink) Old 11-23-2008, 03:01 AM
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Any time there is way too much of something in the water, the first and best step is to do a big water change, at least 50%. If you want to you can do another big water change immediately after. That pair of water changes should bring down the concentration of anything in the water to less than a quarter of what it was.

Do you fertilize the tank? How do you do it? Is your tap water high in phosphates (highly unlikely in the USA)? Did you calibrate the phosphate test kit to find out how accurate it is?

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post #3 of 6 (permalink) Old 11-23-2008, 03:48 AM Thread Starter
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I dose excel and iron every day. I use ro water, so it shouldn't be that. I thought about doing like a 50% water change everyday for about a week. Maybe that would do it?
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post #4 of 6 (permalink) Old 11-23-2008, 04:23 AM
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My phosphates are 5ppm+ and I have little to no algae. That is not the root of your algae. What are your lighting parameters? How many hours per day? What other dosing other than excel and iron do you dose?

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post #5 of 6 (permalink) Old 11-29-2008, 01:02 PM
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"Through the roof" means what? Anyway, here's a WC method that I have used that will take a parameter from 100% down to 5% in no time flat:


How to Reduce High Toxic Nitrates Quickly & Efficiently

The article is about nitrates, but the math is the same for anything else also....


The bigger problem is: With RO water---where is the P04 coming from....?


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post #6 of 6 (permalink) Old 11-29-2008, 03:25 PM
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Don't downplay the importance of calibrating your test kit for phosphate. And, don't assume a LFS has calibrated its test kit either - they haven't. The test kits we use are cheap, easy to use, and not very accurate. They also have limited shelf life. Even new phosphate test kits can be way off in their readings.

You need to make a water solution with a known concentration of phosphate in it, and use that to make sure your test kit is giving meaningful results. Here is a basic primer on making solutions with known ppm of nutrients in them: http://www.csd.net/~cgadd/aqua/art_p...osage_calc.htm

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