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Re: Can't kill this greenwater ! HELP :) (and question about CF lighting)

Hi Jon & Laura,

I've had 2 tanks here with greenwater for a long time. One tank, a 10 gallon
on a bay window shelf has persisted since setup last summer. I've ripped it
apart, boiled sand, added more sand, packed it with plants, and left it
without fish. All I ever got was green water. Somehow the plants survive in
there, even grow, but nothing much to look at.

Another tank was a 29 gallon. I installed some time ago 2x55 compact
flourescents over it. After a couple of happy weeks of watching plants
pearling (was it that long? maybe just a week) it turned green. With the
exception of a day here and there, it was essentially green.

Today, neither tank is green. Here was my remedy:

In the 10 gallon, I removed filtration and heater and threw in a scoop of
daphnia. I figured it would take them a while to get the tank clean, and in
fact was concerned that the green water would kill them off, as it was quite
dense. I've had daphnia crash in very green water in the past. I had read
that some green water algaes can smother daphnia, and I figured my brand was
not to their liking. (I've actually been feeding the daphnia tank, which is
situated right next to my green water tank, with spirulina powder & yeast.
duh) Well, to my surprise, within approx 3 to 4 days, the tank was CLEAR. I
am now _feeding_ the daphnia in this planted tank. Maybe one day I'll put
fish in there, but I'm pretty sure it will turn green without the daphnia.
Besides, what's wrong with keeping a daphnia & plant tank? The only problem
there is I have soft water--so I upped the hardness.

The 29 gallon tank was not much of a head scratcher either. I've had 2 x 40
watt compact flourescent bulbs sitting here just in case. I've had to rewire
the homemade canopy I made eventually anyway, so I decide to complete the
project, and wire it for 2 x 40 watt bulbs as opposed to 2 x 55 watt bulbs.
I ripped everything out, roots and all, because the tank was so overgrown
that plants were trailing all over the surface, yet the tank was still
green. In any case, when the tank cleared up from the murk, it was clear and
has remained so. The only problem is I'm getting some staghorn now and that
tufty stuff that grows on the gravel. But no green water. Which is a nice
thing, because this tank is reserved for what I consider the most attractive
plants, which, during the greenwater days, rendered them virtually invisible
to the viewer.

I wanted to make a note of this to Laura, who is contemplating the amount of
light to put over her tank. Too much of a good thing is not necessarily just
more of a good thing. It can just be a headache. Get it right from the

Good luck to both,


> Date: Mon, 16 Apr 2001 19:44:47 +0800
> From: "J. Hammond" <geohammo at iinet_net.au>
> Subject: Can't kill this greenwater ! HELP :)
> Ok I have blanked out the tank for 2 weeks with a heavy black blanket and
> checked and the tank had cleared significantly but was still not crystal
> clear.  I changed 70% of the water and installed my new lights (180W of
> fluro over a 50gal tank) and in a few days the tank and gone liek peas
> again ! what should I do ? I thought maybe I will try and attack it froma
> different angle by heavily planting with something like ambulia, and have
> lots of riccia and duckweed on the surface and then supplement with
> nutrients (which ones should I add?).
> At the moment It had an eheim 2224 professional on it with co2 being
> injected directly into the filter from 2 DIY 2L co2 bottles.
> Any help / suggestions would be greatly appreciated.
> Thanks a heap
> Jon
> Perth, Western Australia
> Date: Mon, 16 Apr 2001 09:00:38 -0600
> From: "Laura Czerwiec" <fishystuff at hotmail_com>
> Subject: Question about AHSupply Lighting
> Hello!  My name is Laura.  I've been lurking for awhile learning a lot of
> great stuff (thanks!), and now I have a question regarding the lights from
> AH Supply.  I have a 75 gallon tank, 48" long, which I've just set up.  I
> want a planted aquarium, and I'm wondering what my best choice for lights
> would be.  I am considering the 4x55 setup that AH Supply offers, would
> be adequate for my tank?  I was considering the 2x96 setup, but I don't
> think that this is enough light.  Please give me your ideas and
> Thanks in advance for your responses!  They are greatly appreciated!  :)
> Laura