Duration for PO4 to stabilize - The Planted Tank Forum
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post #1 of 4 (permalink) Old 04-08-2015, 03:00 PM Thread Starter
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Duration for PO4 to stabilize

I've taken out my Phosguard a few days ago and was wondering how long it takes for Phosphate levels/reading to reach its new equilibrium before I decide how much P dosing I will be required to do. I'm still at around 0.25 right now and nitrate levels are between 5 to 10.


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post #2 of 4 (permalink) Old 04-08-2015, 03:12 PM
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I would give the natural processes a week or two, say a couple of water changes.
Fish food supplies some P, and the plants are removing it. Let this cycle stabilize, but monitor it. If you find the P is crashing, then start dosing. If you find it is climbing too fast, then see what other nutrients might be missing. The plants should be able to keep up with reasonable fish feeding of a sensible stocking level.
They need light, carbon and all the other nutrients, of course.

Fish food supplies a fair amount of N, P and most traces.
Water changes should supply enough Ca, Mg and some other minerals. (a GH of 3 degrees or higher is good)
Usually carbon, potassium and iron are the first elements to think about dosing. These are the ones most often in short supply when the plants really get going.
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post #3 of 4 (permalink) Old 04-08-2015, 03:42 PM
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Good summary Diana.

LFM - I'm interested in dosing strategies - have you already chosen one?
I find it interesting that EI has a N:P ratio of about 6:1, and PPS about 10:1. Are you going to try to develop your own strategy?

Seems by both dosing methods you are 'low' on phosphates (your N:P ratio is closer to 20:1), and it would be interesting to see if you can detect any deficiencies as a result.
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post #4 of 4 (permalink) Old 04-08-2015, 05:26 PM Thread Starter
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I haven't been giving dosing strategies a hard thought yet.
All that I've been doing is dosing with the trio of Seachem Flourish products (Flourish, Excel, Iron). I dose more or less what Seachem recommends and my plants look great and are growing like crazy. I just massaged my iron dosing to get proper iron test readings. To tell you the truth I'm pretty sure my P levels have zeroed out many times when I would put in fresh Phosguard and the looks of my plants never looked worse for wear but I love to learn to do things the right way and I found out from this forum that Phosguard isn't necessary to cope with algae in a planted tank so I'm gonna try to do it right.

my tank is low-tech, 65 gal, 36"L/18"W/24"H, lighting is T5HO 78 WATTS TOTAL with lots of indirect sunlight during day and back of my tank is covered.


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