Re: [APD] Fight against GDA!!!

[Vaughn Hopkins <hoppycalif at yahoo_com>]

Hi Saugata,
I'm sorry to hear that your GDA is still there.  That is one of the  
most persistent algae I have yet seen.  It looks like your light is  
still excessive - the first schedule you proposed is still a 14 hour  
one - too long.  The second is much better, but the 4 hour rest  
period hasn't been shown to bother the algae at all.  So, I suggest  
you just limit the light to 8 hours until the GDA goes away, and for  
a 90 gallon tank, no more than 180 watts until the GDA goes away.   
That would be 5 of your T8's, or 6 at the most.

Lighting is only one of the elements in encouraging algae, but it  
sure looks like the major one to me.  My GDA episodes always had the  
shady areas of glass with none at all, and the most lighted areas  
with the maximum amount.

Vaughn H.

On Dec 13, 2006, at 8:09 PM, Saugata Banerjee wrote:

> Hi!,
>
> In my fight against GDA I let them grow for about 1 month and then  
> did back
> to back w/c after scraping them off. Post this I did 70% w/c on the  
> next two
> days i.e., on last Sunday & Monday but unfortunately I can see the  
> damn
> thing coming back by yesterday night. I have now reduced the light  
> level to
> 10 hrs from 12 hrs with a siesta of 3 hrs in between. In fact what  
> I am
> planning to do is have the following lighting arrangements:-
>
> 8 AM to 12 Noon - T8 @ 36watts x 2 nos
> 12 Noon to 8 PM - T8 @ 36 watts x 8 nos
> 8 PM to 10 PM - T8 @ 36watts x 2 nos
>
> OR
>
> 8 AM to 12 Noon - T8 @ 36 watts x 8 nos
> 12 Noon to 4 PM -  lights off
> 4 PM to 8 PM - T8 @ 36 watts x 8 nos
>
> Which one do you think will help the most? As I understand excess  
> light is
> also responsible for GDA.
>
> By the way, my fert dosing schedule is as follows:-
> On the day of w/c - 20 mls of KNO3 (stock sol. of 8 tb spoons in  
> 400 mls of
> Distillled water), 6 mls of KH2PO4 (stock sol. of 2 tb spoons in  
> 400 mls of
> distilled water, 6 mls of Trace elements). on the 4th day 20 mls of  
> KNO3, 6
> mls of KH2PO4 & 6 mls of Traces.
>
> Is this ok or I need to tweek it around a bit?
>
> Eagerly looking forward to inputs from experts.
>
>
> Regards,
>
> Saugata
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