Liquid fertz. How much is too much? - The Planted Tank Forum
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post #1 of 4 (permalink) Old 05-03-2017, 03:27 PM Thread Starter
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Liquid fertz. How much is too much?

So I dont know whats normal but Im using Seachems aquavitro fertilizers and according to the dosing recommendations im dosing 4x the amount of phosphates/potassium and 2x the amount of nitrogen. But when I do my tests in the evening after the lights go out my phosphates have dropped down to barely 0.25 ppm and nitrates 0. So I decided to test nitrates this morning after i dosed and it still said 0. I shook the 2nd bottle for a whole minute like it says. But then I tested for ammonia since the fertilizer does contain some and the test kit read 0.25.
The nitrates test kit is brand new.
Its a high light tank with a GLA pro system. The plants grow fast and theyre pearling like crazy, it looks like soda in there. I had the fertz all figured out for awhile, but I just did a bit of a rescape and added some driftwood and 2 new species of plants. I added rotala macrandra and Anubias coffefolia. How much more fertz are those plants capable of sucking up that I would need to increase my fertz so much?
And since when did Anubias pearl? Its crazy how much that anubia is spewing oxygen bubbles... I expected it from Rotala macrandra, I did not expect it from the Anubia. Anybody else have and experience with needing to overdose? Whats normal?
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post #2 of 4 (permalink) Old 05-04-2017, 05:16 AM
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You can't really od on the aqua vitro line, its' pps pro method.
Too much?
I do not know, i've had ppm KNO3 of 120 or more, po4 at 10 n above ppm....
It seems an established system of healthy plants can handle anything.
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post #3 of 4 (permalink) Old 05-05-2017, 04:16 AM
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Liquid fertz. How much is too much?

Retest your nitrates. I'm 100% sure that it's not zero. Especially dosing like that. Sorry but no way they are consuming that much. I had this problem even after shaking hard. Do this

Grab the two nitrate API test bottles and tap the two tops together. Pretty hard. Do this for a good 15-30 seconds. The. After that shake the bottles till you literally get a dislocated shoulder. I promise you will see something other than zero. Oh and when you see it shows a dark red I recommend to immediately do a wc. Trust me on this.

My kit was also brand new and showing the same thing. I then did what I said above and my nitrates were actually 80ppm

Another way to verify is do a nitrate test about 30 minutes after dosing. If it shows 0 at that point then I am surely right.

I see that you said that you did test after you dosed. There is absolutely zero chance that it would read 0. Do what I said and you will see. Just knock the two tops with the lids on pretty hard. Then shake really really hard each bottle for at least a minute.


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post #4 of 4 (permalink) Old 05-06-2017, 04:05 PM
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Did you retest the way I mentioned?


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