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Old 06/05/2011, 10:07 AM   #23
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Join Date: Apr 2003
Location: North Carolina
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As far as tuning a scrubber, I would look at factors that limit growth, and do not think a well aerated tank would have a O2 deficiency.

I suspect limiting factors to growth are light, nitrogen, phosphorous, flow rate, and surface area and possibly micronutrients.

When I set up ATS originally I used iron gluconate to test whether micronutrients were a limiting part of algae growth. It appeared it was. I then widened slot and and put in larger pump, and again I suspect flow rate limits growth.

Another issue I am concerned about if nitrate limitation would lead to cyano in display tank. However this may be overcome with adjusting other factors such as light levels or flow rates.

In freshwater planted aquarium, a standard recipe is used to easily grow vascular plants.

1) adjust CO2 levels to 10-15 ppm by injection and controller.
2) add micro nutrient mix for 2 weeks to remove this a limitation
3) add mixture of Potassium chloride and potassium nitrate, maybe 2:1 to reach 5-10 ppm nitrate. Will remove blue-green algae when present.
4) spike phosphates when symptoms of phosphate limitation are seen.

For reef tanks, I suspect iron gluconate may infact also intially lead to cyano. For corals I also much prefer to feed more. instead of add nutrients as organisms are heterotrophic.

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