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Re: [APD] Temperature, Thermometers & Mercurial Sense Perceptions

You are right, side by side comparison works. probably not it you are far away.

        We in the tropics barely think about the temperature
when changing water. Only in December when temperatures
drop down below the range 15-20C it becomes a thought.
Bangalore is about 3000 ft ASL and gets pretty cool in winter.
I use heaters for about 3 months in the year and have never
bothered to heat the water before a water change and not
noticed any ill effect on the fish. All my tanks are in an open

        I have noticed that larger the tank lesser the variation
in temperature and my pond keeps a decent temperature even
in December. The water is warmer than the smaller tanks.. In
large water bodies the temperature should be quite stable
considering the ground below acts like a thermal buffer.

        What is worrying is not the cost of thermometer but we
should consciously buy or switch to non mercury (alcohol) ones.
What do we do with the mercury ones?


At 30/06/05, you wrote:
When you immediately sample two diff volumes of water right
next to each other, it's not hard to judge whether they are
within a few degrees of each other. And it's pretty clear
that that is plenty close enough for fish and plants. The
consistency in temperature sense perception is pretty good
over very short intervals of time.

Otoh, if you are setting the water temp at a sink that is
some distance away from the aquaria -- about 30 feet in my
case -- then temperature perception can be much farther
off. Rather than running back and forth from the aquaria to
the sink and vainly hoping that my temperature sense memory
is doing a remarkable job, I just set the faucet flow for a
specific temp, give or take a few degrees, then carry the
hose outlet to the aquaria and fill.

Depending on the size of the hot water supply and the
amount of refill water needed, the temp can remain
reasonably constant after being set or can steadily decline
as more water enters the hot water heater. This is probably
only an issue if one is filling very many gallons of
aquarium water, ay maybe 100 or more gallons.

Of course, anyone that's ever come into the house after
spending time outside on a cold winter day, and then put
one's hands under a flow of tepid water, knows that a
human's ability to judge specific temperatures is subject
to considerable vagueness.

If I spend $50 or more each year on CO2 and maybe half that
on fish food, then considering saving two or three dollars
on a thermometer doesn't occupy much of my purchasing
decisionmaking. Alas, I am a victim of the theory of
marginal utility -- or maybe not a victim, maybe i just
surrendered ;-) . I do not dismiss frugality as virtue, but
like yogurt, it's a matter of taste and economic

I know longer use buckets to perform water changes because
it was just to perturbing to look into those white buckets
and wonder what color the water was ;-) .

For a similar reason, I have left off using straight pins
and their confounding head-size as measured in

Completely unrelated to my pinhead thinking, I ask, how
many folks actually enjoy water changes? Is it not still
the number three least liked part of maintaining fresh
water aquaria?

Have plants, have fish, have a ball,
Scott H.

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