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A classic treatment is to remove the fish and add ammonium nitrate
(NH4NO3, plant fertilizer, can be obtained in a gaden store) at a dose
of 350 milligrams/gallon (5 grains/gal). The concentration is not that
critical. A heaping teaspoon will be about 10 grams = 10.000 milligrams.
The plants will not be hurt at all.
After 24 hours change most of the water, return the fish, and the tank
> OK , I read some other treatments- if you can't get formaldehyde (from
> killinews jan 1990). For soft water, add acetic acid (clear vinegar)
> until pH drops to 4. Its not the pH that killis them though. Apparently
> things that can survive pH 4 overnight will be fine- snails plants etc-
> some fish. For hard water add amonium salts until pH7.8 -8 is reached.
> Again its not the pH that kills them , but this gives a guide as to how
> much to use.Both the above required big water changes afterwards.
> Heating to 42 degrees C will kill hydra, but anubias , java fern and
> moss will all survive- careful though, as a few degrees extra will kill
> plants.Apparently snails with hydra on their shells have left the water,
> due to the heat , and then gone back in next day. I have not tried any
> of the above, and i'd be inclined to remove fish first, just in case.
> I've always just left tanks empty , and let them die of starvation.
> > -----Original Message-----
> > From: Lilia Stepanova [SMTP:ls691035 at bcm_tmc.edu]
> > Sent: Tuesday, August 11, 1998 3:30 AM
> > To: killietalk at aka_org
> > Subject: Re: Hydra
> > I heard about it too, and I think the reason it worked was a release
> > of
> > heavy methal ions from electrodes in the water, so basically it is the
> > same as copper treatment. It requires heavy water changes after
> > overwise
> > it will affect fish. I read the treatment is for couple of hours only.
> > Best
> > Lilia
> > On Mon, 10 Aug 1998, Kudzu wrote:
> > > Well I hesitate to offer this but maybe someone else has heard of
> > > this. First let me say I have never tried this and DO NOT know if it
> > > works!
> > >
> > > Somewhere on the Net I read about getting rid of hydra (maybe the
> > > Aquatic Plant list?). The writer said that he used one of the square
> > > lantern batteries. If memory serves they are 6 volt? Anyway, he took
> > > one of those and hooked a wire to each post (two separate wires not
> > > connected to each other!!!). Then he stripped several inches off the
> > > free end of each wire and put one in each corner of the tank.
> > >
> > > I am not sure how long he left it but seems like it was overnight?
> > > Anyway the poster swore it worked and it never had hurt any fish. I
> > > stored this in the back of my mind as one of those things to try if
> > I
> > > ever needed.
> > >
> > > So Far Whats it Worth..........
> > >
> > > Jeff <*\\><
> > > "Consider carefully what you hear", he continued "With the measure
> > you
> > > use it, it will be measured to you -- and even more. Whoever has
> > will
> > > be given more; whoever does not have, even what he has will be taken
> > > from him." Mark 4:24,25
> > > www.airnet.net/kudzu/ "Kudzu's Christian Clipart Collection"
> > >
> > >
- RE: Hydra
- From: "J.P.Haffegee" <J.P.Haffegee at open_ac.uk>