Re: [AGA Member] UV Sterilizers

["John G. Glaeser" <jglaeser@wisc.edu>]

Concerning the Aaron Glass question. Whether it does or does not 
oxidize trace elements, UV sterilizers will "nuke green water, which 
leads to a related thread:

GW happens when nutrient imbalance occurs.

In a very brightly lighted and heavily planted aquaria, plants will 
have a high metabolic rate and will strip out nutrients quickly. Though 
higher order plants may look good because of accumulated 
nutrients/stored carbohydrates, the water column may be pretty much 
depleted. Then, opportunistic GW algae will take off.

I had a 125 gallon heavily planted aquaria, overly illuminated. Once a 
week I adding 60 ml Kent Freshwater Plant (Micronutrient supplement 
with iron and K) and 60 ml Kent ProPlant (mainly nitrogen). This is a 
lot. GW and other algae frustrations prevailed. I discovered plants 
were using up these nutrients within a half a week. I cut light by 1/3. 
Results = algae problems gone and need for fertilization reduced 
dramatically. I use Hach digital colorimeter testing instruments for 
Nitrate, Iron and Phosphate.

John Glaeser

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