EI fertilizing for tank volume or water volume? - The Planted Tank Forum
 
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post #1 of 7 (permalink) Old 05-31-2015, 03:47 PM Thread Starter
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EI fertilizing for tank volume or water volume?

Because of the 50% water changes, it likely is a moot point. However, I was wondering how you all decide what doses to use in your tanks.

For instance, in my 75g tank. I have 200# of substrate which equates to about 15 gallons of water volume. I will be adding in hardscape (likely some boulders). So in my case it is possible that I may have only 50 gallons of water in my 75 gallon tank.

The dosing amount are quite different for a 50 gallon vs 75 gallon.

Currently I dose for tank size and have no issues with nutrient overload (as far as I can tell).

So, what do you all do?

Ben
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post #2 of 7 (permalink) Old 06-01-2015, 02:14 PM
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If you were accurate, you would calculate using the actual amount of water. This would lead to the expected ppm for each nutrient.

In your example, if you dose for 75g and actually have 50g, you are dosing about 50% more than you think (in terms of ppm).

But the ppm ranges are so wide (i.e. 15-30ppm) that it probably doesn't matter (unless you target the high side).
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post #3 of 7 (permalink) Old 06-01-2015, 02:38 PM
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Additional thought...how might you guess correctly ?
I understand the problem/w guessing how much water you removed from the supposed total when you put in the sub etc.
So I enter 8.5g when I use the calculator instead of the 10g tank size.
Once you have all the "stuff" in there take out some of the water till you get to just a bit under the half way mark on the glass. But siphon it into gallon jugs.
This I'll bet gives you a fair total of what you took out and you double it to see what the total water volume is. Now tell me you have a sump and we really have a problem in
the figuring...LOL...
Just an idea how you might get a fairly close total.
I use the EI, but only one dose of it because I don't use CO2 just Excel.
I likely should be using the level for 10g since I'm leaving off two doses.

The shortest distance between any two points is a straight line...in the opposite direction...
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post #4 of 7 (permalink) Old 06-01-2015, 03:13 PM
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I would measure your tank dimensions, measure the height from the substrate to the waterline and calculate a volume that way. Then subtract for what you estimate the volume of all decorations are.
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post #5 of 7 (permalink) Old 06-01-2015, 03:20 PM
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I just go with tank volume. I think we over analyze things some times.
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post #6 of 7 (permalink) Old 06-01-2015, 03:35 PM Thread Starter
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I was thinking along the lines of saving ferts, by not overdoing it.
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post #7 of 7 (permalink) Old 06-01-2015, 03:37 PM
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I use teaspoons instead of grams. Put too much fertilizer in, I get too much plant growth. I back the fertilizer off for good plant growth and no algae. Each tank could be different, but this works well for me.
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