Does Feeding Provide Enough PO4? - The Planted Tank Forum
 
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post #1 of 4 (permalink) Old 02-02-2016, 05:46 AM Thread Starter
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Does Feeding Provide Enough PO4?

I have a fully stocked 55g moderately planted tank. I've got 2 large angels and 2 blue gouramis and about 20 tetras and pencilfish + 4 SAE's and 3 corys.

So my question is, will waste from feeding a decent amount 2 times a day provide enough phosphate for my plants? I can't measure phosphate but I know Nitrate is staying at around 10-15 ppm.

I have DIY co2 (4 2l bottles) and I run 2 T5 HO lights for about 7 hours a day.
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post #2 of 4 (permalink) Old 02-02-2016, 09:14 AM
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Prolly so.
Might need to add potassium K from K2SO4 mineral salt once a week 1/4 tsp if you begin observing pin holes on leaves of plant's that aren't result of snail's.IMHO
Flourish comprehensive could work for trace mineral's.
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post #3 of 4 (permalink) Old 02-02-2016, 06:10 PM
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For naturally slow growing plants the fish food/fish waste should be adequate. For fast growing plants in large quantities in the tank, I doubt that fish food/fish waste would be enough. For a mix of growth rate plants, which is probably typical, you would have to experiment to find out, if you really want to know. If it isn't enough I would expect to see problems with the least competitive fast growing plants. It isn't an easy thing to determine, because a shortage of just one of the nutrients slows down the growth, and that slower growth may reduce the demand for phosphorous enough that fish food/fish waste supplies enough. When hobbyists first began to dose phosphates they quickly learned that eliminating the shortage of phosphates often led to shortages in other nutrients, so they had to dose more of everything else once they started dosing phosphates.

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post #4 of 4 (permalink) Old 02-02-2016, 09:19 PM Thread Starter
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Quote:
Originally Posted by Hoppy View Post
It isn't an easy thing to determine, because a shortage of just one of the nutrients slows down the growth, and that slower growth may reduce the demand for phosphorous enough that fish food/fish waste supplies enough. When hobbyists first began to dose phosphates they quickly learned that eliminating the shortage of phosphates often led to shortages in other nutrients, so they had to dose more of everything else once they started dosing phosphates.
Yeah that makes sense. So you can't really be sure unless you test. Well I guess I'll have to drop 20 bucks on a test kit then.

What you said about thr plants is about right. I would say I have about 50/50 slower vs. faster. A reineckii and Java Fern are slower while the various vallisneria and rotala species are on the faster side. Sometimes too fast.

I think the other stuff should be covered if increasing PO4 were to increase demand. I'm adding enough CSM+B to keep iron at around 1ppm and enough GH booster to keep K, Ca and Mg way higher than the plants will use. The fish keep nitrate plenty high as well. I stopped having to dose KNO3 since levels are stable or even increase over the week. Thanks mostly to the angels.
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