Peat causing high phosphate levels? - The Planted Tank Forum
 
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post #1 of 7 (permalink) Old 07-29-2013, 09:20 PM Thread Starter
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Peat causing high phosphate levels?

Hello,

I recently purchased an API phosphate test. I tested my 20 gallon tank and it was well over 10 ppm. I tested the water out of the tap and its almost zero. The tank is miracle grow organic potting soil, capped with sand, a canister filter with peat in it to keep the ph 6.8. The water out of my tap is above 8.0 so I use the peat to keep it lower.

Do you think it's the peat raising the phosphates? Or maybe the soil is leeching some? It's a heavily planted tank with pretty good growth.

~Kate
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post #2 of 7 (permalink) Old 07-29-2013, 09:26 PM
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Peat wouldn't cause the phosphate levels you're seeing in your tank, but the MGO may be the source, are you dosing any ferts to the tank?
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post #3 of 7 (permalink) Old 07-30-2013, 01:05 AM
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Quote:
Originally Posted by Kate6790 View Post
Hello,

I recently purchased an API phosphate test. I tested my 20 gallon tank and it was well over 10 ppm. I tested the water out of the tap and its almost zero. The tank is miracle grow organic potting soil, capped with sand, a canister filter with peat in it to keep the ph 6.8. The water out of my tap is above 8.0 so I use the peat to keep it lower.

Do you think it's the peat raising the phosphates? Or maybe the soil is leeching some? It's a heavily planted tank with pretty good growth.

there are many reasons PO4 levels can go up, excess food, waste or dosing PO4. people who use Aqua soil should find very low levels of PO4 in the water, Aqua soil absorb PO4 very fast. Peat moss should also act in a similar way and should absorb nutrients from the water. you should not dose any PO4 and see if those numbers go down, plant and soil both will uptake the po4. in my high light tank i would dose 0.5ppm PO4 per day and it would be 0 by the end of day, am using aqua soil though.
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post #4 of 7 (permalink) Old 07-30-2013, 04:17 AM
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Read the label on the peat. Some has surfactants added, and some may have fertilizers added.

You can test each thing from the tank in a separate jar, and see if any one thing is adding the phosphate.
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post #5 of 7 (permalink) Old 07-31-2013, 03:29 AM
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Miracle Gro has fertilizers. Usually high on nitrates and phosphates. I know, I used Miracle Gro Sphagnum Peat under Flourite as substrate. Phosphate levels were like yours. Over the roof. Used Seachem phosguard to bring it down. Brought down my phosphate level to 0.25 ppm after 2 weeks. Also had problems with cloudy water. Water change would clear it but cloudiness would come back after 2 days. Used purigen to take care of that. Just today, I took out the phosguard from my canister filter as I was getting too low levels of phosphate. Will see how high it gets. Hopefully, the fertilizer has run out and I wouldn't need to place the phosguard back.

Last edited by Black Pearl; 07-31-2013 at 07:17 PM. Reason: grammar
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post #6 of 7 (permalink) Old 08-01-2013, 01:20 PM
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Peat would not affect the level of phosphate as I have seen many people using the same and it is not affecting there phosphate level.
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post #7 of 7 (permalink) Old 08-01-2013, 07:37 PM Thread Starter
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Okay, I figured it was most likely the miracle grow, but I've never tested phosphates before so I wasn't sure if maybe the new peat did it. I did dose one of my tanks with kh2p04, but I will not be doing that any more now that I know my soil provides plenty. Thanks for the help every one.

~Kate
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