Dry Dosing - The Planted Tank Forum
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post #1 of 5 (permalink) Old 10-22-2005, 02:57 PM Thread Starter
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Dry Dosing

I want to thank all who make this site possible. The information provided is great! I only wish I had found it sooner.

After several attempts over many years I think I am close to getting things right. Using this site I figured out my macros were off. (I wasn't dosing for them at all.)

To get things turned around quickly, as in today, I am going to get the Flourish products that I need. When they are used up I will order the dry compounds from Gregg Watson.

Here is where I am still confused. Why do I read of people mixing those compounds with water to make a storable solution? What is the problem, or danger, of just adding the dry compounds to the tank? My tank is 150 gallons so the amounts to add per dose are large enough that measuring shouldn't be a problem.

Sorry if this is a duh question, but since I haven't done it yet I don't know the logisitics.
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post #2 of 5 (permalink) Old 10-22-2005, 03:33 PM
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There is no problem. I would guess that most of the people dosing bulk dry nutrients into larger tanks are dosing dry.

What I do is fill a small bottle with tank water, add the powders, swirl till dissolved and pour back into the tank.
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post #3 of 5 (permalink) Old 10-23-2005, 02:12 PM Thread Starter
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Thank you Rex. That was what I was thinking about doing.

There was a thread recently in the General forum that indicated there is a possibility of chemicals canceling out if added together. Do you have any thoughts on this?

Also - I had always heard "don't add fertilizers with phosphates". Logic being the fish add enough. I live fairly close to TFP and went there yesterday to get the supplies I needed. In case you don't know this place is huge and they have always had anything I wanted or even wanted to look at. They didn't have Flourish Phosphorus. Told me nobody buys it so they don't waste shelf space. This is in a 110,000 ft2 store! What's the scoop?
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post #4 of 5 (permalink) Old 10-23-2005, 02:21 PM
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the only ferts you shouldn't dose together are PO4 and Fe. You can dose NO3 and PO4 together fine.

Keeping in mind, that Traces have Fe in it, whether it is CSM+B (Plantex) or Flourish line Traces, so just make sure you dose PO4 on off days from those. Basically, just dose PO4 along with other Macros.

You can buy KH2PO4 from Greg Watson cheap. Works just as well as Flourish Phosporous does. And extremely chaper in the long run.

Fish don't actually create PO4, btw. PO4 naturally comes from decaying plant matter and foods.

450g Planted Discus Tank - Work in Process!
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post #5 of 5 (permalink) Old 10-23-2005, 03:33 PM
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There was also a fairly popular theory a few years back that limiting phosphates helped to keep algae at bay. I think there is now overwhelming evidence that this really isn't the case. Most here subscribe to keeping PO4 around 2 ppm, as it seems to limit/eliminate green spot algae on the glass.

Good luck!
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