Am i dosing too much?! - The Planted Tank Forum

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post #1 of 18 (permalink) Old 08-04-2014, 01:13 PM Thread Starter
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Am i dosing too much?!

low tech 75g with 60g of water volume. No co2 or excel. Heavily planted.
50% wc weekly, lights on 9 hours a day, finnex planted plus 21" above substrate.

I am dosing 4 times a week. 2x macros and 2x micros. for macro i am dosing 1/4 tsp k2so4 and 1/10 tsp k2hpo4, for micros i am dosing plantex csm+b 1/4 tsp at a time.

Is this too much ferts? Any potential issues dosing this amount? here is a pretty recent pic of my tank. Tank is just a little more than 4 months old.

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post #2 of 18 (permalink) Old 08-04-2014, 04:04 PM
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I would check this/w Zorfox.
I have a 10g and it's not likely exactly on what the calculator said but I was dosing 1/4 tsp K2SO4 and 1/64 tsp KH2PO4 when I noticed an answer to a similar question stated that the KH2PO4 was high and that in order to get in in the correct proportion you would need a 1/100th tsp measuring device.
The doses I was using were on the part which list "and I am dosing for" and I entered
"EI Low light/weekly" so that was only one dose per week.
The overall picture I'm getting is that you are far from being too much but still the
KH2PO4 is at a higher proportion than usual. If that will cause a problem I am not sure of but KH2PO4 is the only nutrient(Macro)that I have read any comments about being able to harm a tank by over doing.
Likely any nutrient I put in a few tablespoons of would hurt something but we're talking
something like oops I put two doses of KNO3 instead of one dose.
But if you'r happy with the way the plants are growing/looking then I would not add any more unless some obvious deficiency was there.

The shortest distance between any two points is a straight line...in the opposite direction...
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post #3 of 18 (permalink) Old 08-04-2014, 04:30 PM
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I dose 80 gal low tech NON CO2 ,excel,glut,etc once a week with
1/2 to 3/4 tsp KNO3
1/2 tsp KH2PO4
1/2 tsp CSM+B
50% water change each week.
Fish and shrimps are fine with this for last couple years and plant's do well.
Now this is just my tank/dosing but I would not worry bout the dosing you mentioned.
Point being,,you would have to get way carried away with the dry salts to have anything to worry bout.
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post #4 of 18 (permalink) Old 08-04-2014, 05:01 PM Thread Starter
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Do you ever notice deficiencies with that dosing? What size tank? What light? How long photoperiod?

Thanks
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post #5 of 18 (permalink) Old 08-04-2014, 05:14 PM
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Quote:
Originally Posted by philipraposo1982 View Post
Do you ever notice deficiencies with that dosing? What size tank? What light? How long photoperiod?

Thanks

80 gal ,54 watt X 4 bulbs hanging nine inches above the surface of the tank and 8 hour photo period.CO2 deficiency is only limiting factor I am able to see.
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post #6 of 18 (permalink) Old 08-04-2014, 05:17 PM Thread Starter
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Cool, do you think there is a benefit to dosing over a couple days vs all in 1 day like how you do it?

Bump:
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post #7 of 18 (permalink) Old 08-04-2014, 05:32 PM
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Well,for me it is easiest to dose everything once a week rather than twice.
Am afraid I would find it easy to forget (Have seen me do it before).
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post #8 of 18 (permalink) Old 08-04-2014, 05:34 PM Thread Starter
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Thinking the same for myself. I will switch to once a week
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post #9 of 18 (permalink) Old 08-04-2014, 05:46 PM
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The doses you're using are fine for low tech. Since you're not dosing KNO3 I assume your nitrates are maintaining over 5ppm? It wouldn't be a bad idea to dose 1/8 teaspoon of KNO3 on macro days. I wouldn't rely on your test kit's results. This 5ppm per week won't break your tank. Not having enough however can.

No need to worry about it being too much since you're doing 50% weekly water changes. The key is to dose enough which you are. Low tech with no CO2 probably needs around 10% of the full EI dose. As you can see below you are well above that range.
Code:
Element           Your dosing     Full EI Dosing
K                   7.7ppm            22.5ppm
PO4                 3.4ppm            3.9ppm
Fe (Plantex)        0.62ppm           1.5ppm
I like dosing 3 times a week because some of the elements (the chelated elements) in the micro solutions don't remain available for plants very long. This small detail won't make a huge difference but it is something to consider.
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post #10 of 18 (permalink) Old 08-04-2014, 05:58 PM Thread Starter
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How did you get those value zorfox? Thanks for the good advice everyone.
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post #11 of 18 (permalink) Old 08-04-2014, 09:21 PM
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Quote:
Originally Posted by philipraposo1982 View Post
How did you get those value zorfox? Thanks for the good advice everyone.
Wet's calculator. Actually, I used my own but Wet's works the same way.

Under the section "and I am calculating for" select "the result of my dose". Remember to total each common element up. In your case potassium. As far as the EI doses there are thousands of references to them. Wet's calculator is setup to calculate based on which method you use. So no need to know them. Just select which method you want to use.
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post #12 of 18 (permalink) Old 08-07-2014, 04:57 AM
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Hey there,

I have a question...why are you guys doing large weekly wáter changes if you're running a low-tech? I have a low-medium light, pressurized CO2, and dose macros and micros plus iron once a week, each. And I only do a 30-40% wc every 2 weeks.
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post #13 of 18 (permalink) Old 08-07-2014, 06:15 AM
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If you go to the calculator and on that part which says "and I am dosing for" and then select "the results of my dosing" you will fid a section which tells you the build up after
the amount of time you select.
Then enter what you are dosing and it will tell you if the amount of build up is OK or dangerous. What you are dosing may be substantially less than what they are dosing.
But if it is not you are accumilating nutrients in there by not doing larger weekly water changes. Most of what they are talking about deals/w ferts close to the EI amounts and EI ferts REQUIRE weekly water changes to prevent build up.
Link to calculator found in post 11.

The shortest distance between any two points is a straight line...in the opposite direction...
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post #14 of 18 (permalink) Old 08-07-2014, 09:54 AM Thread Starter
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Quote:
Originally Posted by sepehr View Post
Hey there,

I have a question...why are you guys doing large weekly wáter changes if you're running a low-tech? I have a low-medium light, pressurized CO2, and dose macros and micros plus iron once a week, each. And I only do a 30-40% wc every 2 weeks.
For me the main reason is to reduce nitrates. I have a fairly healthy bio load and in a week it climbs about 15-20ppm so I do a WC to bring it back down.

It also replenishes the minerals in the water and removes organics.
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post #15 of 18 (permalink) Old 08-07-2014, 01:19 PM
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The best way of knowing if you're dosing too much or not is by gauging the plants. If you think you're plants are doing ok by you're standards, then your formula is working. I wouldn't change the dosing if nothing is wrong. There's no really way of knowing how much our tank needs precisely, it's just approximation, and adjust by plants reaction.
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