hep dosing monopotassium phospate! - The Planted Tank Forum
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post #1 of 8 (permalink) Old 09-20-2016, 11:52 AM Thread Starter
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hep dosing monopotassium phospate!

hi all, i'm trying to get a handle on how much monopotassium phosphate i should be dosing. at the moment im getting 1mg/l. I believe it should between 0.2 and 0.5mg/l. Am i right? will 1mg/l have a negative effect on my plants? thanks everyone!
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post #2 of 8 (permalink) Old 09-20-2016, 02:53 PM
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Hi seanbugeja,

Welcome to TPT!

It depends upon what method of dosing you are using as to the target ppm level for PO4.

The EI (Estimative Index) method by Tom Barr recommends 2.0 ppm - 5.0 ppm of PO4 so you are still low if that is the method you are using.

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post #3 of 8 (permalink) Old 09-20-2016, 04:40 PM Thread Starter
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Well I'm not following any method. Just dosing kno3 3 times a week and trace 3 times a week. Mgs04 once a week. What so you think? Thanks
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post #4 of 8 (permalink) Old 09-20-2016, 05:45 PM
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There isn't really a one size fits all answer. Assuming that you're dosing three times a week, have medium light and you're using CO2 that amount is a place to start. Some will tell you it's too much, others might tell you it's not enough. It just depends on what "method" they prefer and their experience. As time goes on and you observe your tank then you can decide if you need more or less.

There are some who think that "excess" phosphorous contributes to algae and any more PO4 that what you get from fish food and waste is too much and others who think it's best to have more than the plants will use to rule out the possibility of any deficiencies. I add 0.5 ppm/day in my tank with medium light and pressurized CO2. I have no algae issues, IMO, and the plants are healthy and growing. The fish also are healthy, happy, and long lived. Others might see it as too much or too little, but for me it works. You'll have to determine what works for your tank over time as well.

Last edited by Jeff5614; 09-20-2016 at 05:57 PM. Reason: ...
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post #5 of 8 (permalink) Old 09-20-2016, 05:49 PM Thread Starter
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Thanks a lot
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post #6 of 8 (permalink) Old 09-20-2016, 07:12 PM
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If you get green spot algae on the glass, you probably could dose more PO4 with no problems. There is no consistent evidence that high phosphate levels in a planted tank cause algae anyway.

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post #7 of 8 (permalink) Old 09-20-2016, 07:27 PM Thread Starter
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if i get or dont get green spot algae? is the sentence you wrote correct? will po4 reduce green spot algae? im seeing some on the glass atm. thanks hoppy your always there to help
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post #8 of 8 (permalink) Old 09-21-2016, 12:27 AM
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PO4 reduces the risk of getting GSA. In my case it has been eliminating that risk since I first started dosing twice what the EI dosing lists call for. I haven't seen any GSA in my tanks since then, about 5 years.
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