Uptake % advice when using Rotala's accumulation calculator - The Planted Tank Forum
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post #1 of 3 (permalink) Old 08-24-2019, 01:18 PM Thread Starter
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Uptake % advice when using Rotala's accumulation calculator

I wanted to start experimenting with a dosing regiment I created myself for my nano aquarium. I'd like to be as precise as possible and start out on the right foot when beginning a dosing regiment and account for what I can, having such a small tank has me worried about how easy imbalances can occur and quickly things can change in the system if I incorrectly account for plant uptake and overdose.

I have collected many different "ideal ranges" for what certain nutrients and parameters should be in my water column, which was crucial for creating a dosing regiment obviously. I decided to utilize Rotala nutrient calculator and Rotala accumulation calculator to create a dosing regiment. However, I ran into the problem of accounting for the plant's uptake of the nutrients in ppm's. This information was difficult to find because it isn't uniform among all tanks, which makes sense. And I found that 15% plant uptake vs 80% uptake can swing the accumulation chart and therefore, what I should be dosing vs what I definitely should not be dosing wildly one way or another.

What I decided to do was create a dosing regiment around an uptake range of 25 and 75 percent. So that, for example, dosing 1 drop of Iron per day would put my water's ppms in largely in the "ideal" range for iron concentration whether my plants were consuming 25% or 75% of the ppms per day.

However, recently, I stumbled upon a few threads here that talked about how very little nitrates plants consume per day, I don't remember the exact number but it was .5-2ppm or something close, with PO4 being lower. This ruined the dosing regiment I had created based about those uptake percentages. It turns out uptake is much lower than 25% per day perhaps half that amount.

I'm hoping someone can help me with a starting uptake ppm value to plug that into the accumulation calculator based on known planted tank knowledge or my tank's plant mass.

As a side note can someone explain what the difference is between nitrates and nitrate "equivalents" are? and the warning message on rotala's nutrient calculator for Flourish Nitrogen: "WARNING: This product has some unknown percentage of N as Urea and as NO3. The calculation and chart below works with NO3 equivalents."

Last edited by nothreat33; 08-24-2019 at 01:33 PM. Reason: aded anotehr question
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post #2 of 3 (permalink) Old 08-24-2019, 03:42 PM
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Uptake is dependent on numerous variables. Variables are how much CO2 is being injected, lighting levels and length of lighting time, nutrient ppm values, plant mass, types of plants, how many fish, types and size of fish, etc. Earlier this year I had my water professional tested after I had been dosing the same amounts consistently over a few weeks and I determined what the uptakes were were for a few compounds, but I realized it was really of no value because of all the variables. Plus the uptakes could vary because of ratio's between compounds and the ppms in the water columns. I've just learned one needs to watch the plants and see how they react.

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post #3 of 3 (permalink) Old 08-24-2019, 08:32 PM
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But simple truth is your just reading yourself into a corner with this tank.

The #1 thing you need to do is buy you little mignon filter so you have some water movement, breakup of surface biofilm and better CO2 dissolution into water, better nutrient dispersion throughout tank as well as supplying better oxygenation to fish, plants and substrate.
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