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Re: [APD] How much diffused lighting (PC's) compared to point source lighting (MH) has to do with GDA

I have certainly noticed that GDA grows mostly where the glass gets  
the highest amount of light.  And, all algae seem to grow best where  
the light is highest.  So, perhaps PC lighting is more of a problem  
in causing GDA than MH lights.  However, MH lights, unless in very  
good reflectors will illuminate the glass well too, especially in the  
lower part of the tank.

Light brings algae.  Too much light brings a lot of algae.  Too much  
light means more light than the plants need to grow well.  And, that  
can be either too much wattage or too long a photo period.

Vaughn H.

On Dec 8, 2006, at 9:26 AM, Greg Fiske wrote:

> For the last month I have been battling GDA.  I've used the method  
> of letting it sit for a month and then cleaning using a diatom and  
> UV filter. So far, no luck.
> I've been in the hobby long enough to know that GDA is not just  
> something you have to live with in a tank, it has to do with  
> something I'm doing wrong.  I've had tanks were I just left them  
> alone and didn't have signs of GDA for a month.  I know my dosing  
> is close because there is no sign of any other algae.  So there are  
> a couple of options to go with,
> I can dose less and assume that what I'm adding to the tank is  
> causing the algae.
> I can dose more and assume that ammonia is causing the algae.  This  
> is because one of the things that I am dosing is the limiting  
> factor.  By dosing more, then plants are using up more ammonia and  
> less is available to the algae.  I mean, isn't this how reef  
> systems operate, less algae because the Corals take up all the  
> nutrients in the water?
> Third, I can play around with the ratios of the Macros and Micros  
> I'm dosing.
> The other thing I haven't looked into is how much diffused lighting  
> (PC's) compared to point source lighting (MH) has to do with GDA.   
> All my GDA appears on the glass, is this because the reflected  
> light of diffused lighting falls the most on the tank sides?

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