Ramping auto dosing fertilizers based on plant density - The Planted Tank Forum
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post #1 of 2 (permalink) Old 07-20-2016, 01:22 AM Thread Starter
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Ramping auto dosing fertilizers based on plant density

I think some people dose fertilizer based on the plant density of their tank.
-How could you program an apex controller to ramp fertilizer dosing based on a range from newly planted to established?
-Does anyone ramp light settings so that once the plants have filled in you could slow down the growth to make it last longer?
-Are most dosing instructions, PPS-pro for example, for an established tank that has a completed aquascape?
-How much would you decrease/increase dosing from newly planted to densely planted?

I noticed that my Co2 would be taken up more when the tank was established compared to newly planted. From 30 ppm down to 20 ppm. Maybe apply that do my fertilizer dosing, start at 2/3rd's and go up from there.
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post #2 of 2 (permalink) Old 07-20-2016, 01:56 AM
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Good, well-thought questions. A lot of this depends on your substrate. Are you using Aquasoil or something inert like sand? The latter means dosing is much much more important. If you have Aquasoil you have a lot more buffer room - the soil itself provides many nutrients, and is able to bind excess cations from the water. I don't think ADA adjusts fertilization based on trims but rather the general aging progression of the tank.

Of course the best way to set up an autodosing system to be able to make such changes in response to what the plants tell you is to have a separate pump for each nutrient (as opposed to a singular macro mix like many use) and mix rather dilute solutions. The timers that control these can usually be adjusted down to a minute basis, but with a very concentrated solution the volume difference from one minute (usually around 1 mL) can contain quite a concentration difference. Furthermore very concentrated solutions are at higher risk of precipitating at the end of the tubing (where the liquid gets dosed into the tank).

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Last edited by Axelrodi202; 07-20-2016 at 02:13 AM. Reason: added info
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