Re: Death In a New Plant Tank
"Thomas Narten" <narten at VNET_IBM.COM> wrote:
>> Last Night while doing my weekly 25% water change all 3 of my black mollies
>> died within 12 hours.
>> Should i buy one of those fancy kits for transfering water from the tap?
>> Should i put my water in a barrel for a day to let the Chlroine evaporate?
>This last comment implies that you are not treating your water before
>adding it to your tank. Do you like living dangerously?
>Although many folks don't bother treating tap water when doing water
>changes, it is a fact that all municipal water has chlorine in it (EPA
Fortunately, this is not true. We have three water sources in Santa Clara. One
is San Jose water, required to have chloramines. San Francisco water
(Hetch-Hetchy) is wonderfully soft, but has chlorine. The center of old Santa
Clara is on wells, and falls below the threshold requiring chloramines (I
think it is 500,000 population and above). Barring a major shutdown or
water-main break that would allow outside sources to be used in an emergency,
we "never" have any chlorine in our tap water. It's just rock hard at 450 ppm
>The exact concentration depends on lots of factors and
>can be highly variable over the course of the year. During the
>summer, for example, chlorine concentrations are generally higher to
>cope with the warmer water temps. If you add enough chlorine to your
>tank during a water change, you will kill your fish. Even if you
>don't kill them, you are probably stressing them.
I sure agree with this. Overnight doesn't help with chloramines, either, for
they are both deadly and stable for more than a week. Breaking the
ammonia-chlorine bond can leave you with toxic levels of ammonia, too, if your
pH is much above neutral.
The solution is to have a serious conversation with your water dept.
engineers, and find out what you are dealing with locally. Then get a proper
product for decontaminating your water, or be prepared to store and air it out
for a couple of weeks.
>Local fish stores in Durham have recently complained about "bad
>water". I have no sympathy for them. Sodium thiosulfate is so cheap
>that there is absolutely no reason not to use it. Just because you've
>"never had a problem before" doesn't mean you won't next week.
How much sodium thiosulphate is an appropriate amount to use, and what does it
do with chloramines? I have photographic sodium thiosulphate on hand, but
wouldn't know how to use it if we did have that hypothetical emergency. Is
trial and error, with a chlorine test, the best way?