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RE: Daphnia and Green Water


I recently tried to circumvent the hungry mouths of SAEs by placing some
Daphnia in one of those breeding nets.  (I forgot the brand name, but it's
one of those little 6in. x 4in. boxes that hangs on the inside of your
tank's frame, made with thin netting.)

First I let them (Daphnia) grow in a small bucket filled with my tank's
green water, then I moved them to this breeding net.  I thought I was smart,
but the critters didn't live more than a day once I placed them into the
tank's water.  I didn't understand the difference between them being in the
bucket vs. the tank - since it's the same water, and even the same
temperature since the bucket was floating in the tank.  But then someone
mentioned something about Amquel and its possible adverse effect on Daphnia
( http://www.actwin.com/fish/aquatic-plants/month.200003/msg00526.html ).  I
do use Amquel and I'm now thinking that maybe that had something to do with

Emilio Ramirez
... in Chicago where our mayor might be a little overworked.

> Date: Wed, 5 Apr 2000 08:40:29 -0500
> From: "James Purchase" <jpurch at interlog_com>
> Subject: RE: Daphnia and Green Water
> The recent posts about Daphnia's abilities to cure a tank with suspended
> green algae intrigued me. Over the weekend, I obtained a bag of Daphnia
> a fellow member of my local plant group (thanks again Franc) and placed
> in one of my plant grow out tanks, whcich doesn't have any fish but does
> have lots of suspended algae (due no doubt to me habit of keeping too many
> nutrients in the water column of this tank).
> Within 12 hours, the previously pea soup green water had cleared
> (and the Daphnia were VERY green). I'm not interested in getting rid of
> of the suspended algae in this tank, because then the Daphnia would
> but I'd bet that they could do it if given the chance. In a tank with fish
> guess the problem would be to maintain enough Daphnia to handle the
> suspended algae while avoiding the hungry mouths of the fish.
> James Purchase
> Toronto