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R: Aquatic Plants Digest V4 #250

> Hi, 4.27.00
> My water is green... it never has been like this before!  I have shut
> off my lights, and the poor fish are living in darkness.  I was thinking
> that since I just set up the tank a week and a 1/2 ago, that there was an
> excess of nutrients...I was hoping that when the plants grew some more,
> that they would absorbe the nutrients.  however, this is impossible
> because the lights are off.  I am afarid that the water will soon be so
> full of algea, that my fish may suffer.  Changing water hasn't
> helped...and when I implimented my Micron Cartidge, it got worse.  My
> tank is a 45 gallon.  I have 2 filters.  I have 5 herbivors.  Any help
> would be appriciated.

Ciao Anna.
In my 100L tank, about 3 months ago, it happened the same problem.
I shut off the light for 2 weeks; initially, the water was clean, but 2 day
after the light was on, the water turned on green again.
I suspended the feeding and any fertilisation, I made many water changes,
without any effect. Nitrate, iron and phosphate concentration were under the
detecting level for my kits.
After 1 month more, I decided to use Erytromycin, initially 3 mg/L for 3
days, and then 6 mg/L.
After 2 weeks in treatment, the situation appeared unchanged, but 5 or 6
days after, the water was slowly changing into clear water.
This week end I'll perform a 50% change of water.
Next week I'll be able to confirm if the treatment will be succesful.

About the previous situation, my fish were not suffering and many
filamentous green algae filled the tank.
Now, all the algae are disappeared.
No fish or filter seems have suffered for the Erytromycin treatment.

(Milan, Italy)

Walter Peris
GAEM Home Page: http://www.gaem.com
Guarda qualche foto su http://digilander.iol.it/WalterP/