phosphate Q - The Planted Tank Forum
 
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post #1 of 10 (permalink) Old 03-01-2013, 04:50 AM Thread Starter
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phosphate Q

I dose micros 1-2x a week, My nitrates flucuate but generally stay from about 20-40- and this is with out dosing, just from fish/shrimp waste I guess. I dose a healthy amount of potassium every week.

I haven't been adding any phosphates, but since I switched to mainly live food I'm wondering if I need to. Not really sure what the phosphate content of live food is compared to the prepared stuff.
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post #2 of 10 (permalink) Old 03-01-2013, 03:28 PM
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I can't directly answer your question. However, I can tell you that if you're going to dose additional P, do it sparingly. Algae go nuts in P-rich water.

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post #3 of 10 (permalink) Old 03-01-2013, 06:54 PM
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Originally Posted by FishFarmer View Post
I can't directly answer your question. However, I can tell you that if you're going to dose additional P, do it sparingly. Algae go nuts in P-rich water.
This has been tested many times and found to not be true. I suggest that you follow a dosing schedule like that described in https://www.plantedtank.net/forums/sh...ad.php?t=21944 This gives you a good idea of about how much of each nutrient it is good to dose. Then, do weekly big water changes to "reset" the water and avoid excessive build-ups of any of the nutrients.

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post #4 of 10 (permalink) Old 03-01-2013, 11:05 PM
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I know everyone hates the T word, but have you tested your phosphates to see where they're at?
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post #5 of 10 (permalink) Old 03-02-2013, 04:54 AM
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I know everyone hates the T word, but have you tested your phosphates to see where they're at?
If you use the T word, then you need to use the S word also, which those that suggest the T seem to hate also ironically

Use a known "Standard".

If you do test, do it the right way, not just wing it and hope the cheap 10$ test kit is going to be accurate.

Trying to argue with hobbyists to test was hard enough, trying to get them to use and make known standards was even harder.

A water change is an easier sell at the end of the day, no amount of nagging will change people's habits and avoidance. I tried for years, just does not work for 90% of people.

Anyway, dosing PO4 is easy and will quickly tell if the tank is limited, PO4 limited plants respond within about 30-45 minutes with increased pearling.




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post #6 of 10 (permalink) Old 03-02-2013, 05:58 AM Thread Starter
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thnaks all.
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post #7 of 10 (permalink) Old 03-02-2013, 09:58 AM
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where should your phosphates be @
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post #8 of 10 (permalink) Old 03-02-2013, 10:15 AM
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Originally Posted by plantbrain View Post
If you use the T word, then you need to use the S word also, which those that suggest the T seem to hate also ironically

Use a known "Standard".

If you do test, do it the right way, not just wing it and hope the cheap 10$ test kit is going to be accurate.

Trying to argue with hobbyists to test was hard enough, trying to get them to use and make known standards was even harder.

A water change is an easier sell at the end of the day, no amount of nagging will change people's habits and avoidance. I tried for years, just does not work for 90% of people.

Anyway, dosing PO4 is easy and will quickly tell if the tank is limited, PO4 limited plants respond within about 30-45 minutes with increased pearling.
Really I didn't know that, now see that's a quick and easy way of knowing if your short of this particular nutrient. Very useful information. I use the Seachem Phosphate test which thankfully comes with a standard to verify their test I usually run around 1.75 mg/L just from my phosphate buffer. The only thing I don't know is whether or not all phosphates are created equally in the eyes of my plants
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post #9 of 10 (permalink) Old 03-02-2013, 07:16 PM
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Generally most PO4 are the same once they dissolve in the water.

You have a pretty wide working range of PO4, but do not let it get too low.

I dose 10 ppm or so every week to my tanks.

It's pretty clear after 18 years of dosing PO4 at high levels, there is no relationship directly to PO4 and algae.




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Tom Barr
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post #10 of 10 (permalink) Old 03-03-2013, 01:52 PM
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Speaking of phosphates, I was reminded by looking at another test kit that mg/L is the same measurement as ppm. So that means that my tanks run about 1.75 ppm of phosphates in them. From your comment above can I assume that I can dose with the regular amount of PPS Pro and not have too much phosphates in my tank?

The amount is 6g of KH2PO4 in 1 L.
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