Suthdown - tropical sand - ammonia/nitrites

I'm hopeless at distance but I can tell you this, that sand was always
submersed in water although at low tide I was only up to about my hips
and at high tide I couldn't even swim out that far. That's Hervey Bay,
when the tide it out it is out for what seems like miles.

Thanks for a link to another forum I can spend time at

Pszemol wrote:
"miskairal" mehiding@Oz wrote in message
u...

Recently when I was swimming at Hervey Bay I discovered that if I dug
my toes into the sand up to my ankles my toes were in very cold sand.
The water temp at the time was disgustingly warm, almost warmer than
my skin temp.


Check this out:
http://www.marinedepot.com/FORUMS/Topic24235-11-1.aspx
How far away from the shore have you been swiming in Hervey Bay?

"miskairal" wrote in message u...
I'm hopeless at distance but I can tell you this, that sand was always
submersed in water although at low tide I was only up to about my hips
and at high tide I couldn't even swim out that far. That's Hervey Bay,
when the tide it out it is out for what seems like miles.

Your experience does not match what Shimek has stated...
I need to find some technical paper on this - but where ? :-)

Thanks for a link to another forum I can spend time at

You are welcome :-

I think you are concerned about something that isn't really an issue.
In a reef tanks with a lot of powerheads, lights, pumps & flow, the
bottom of
the DSB couldn't be much of a different temp at all. I would imagine.
shrugs shoulders

Pszemol wrote:

"RicSeyler" wrote in message
.. .

But you DO want that oxygen-free area at the bottom of the DSB.


I have done some more reading about freshwater heating cables
and now I know what you were talking about: freshwater folks want
to encourage convection water currents using heaters. Warmer
water circulates to the upper layers of the substrate inviting colder
water to the bottom layers... This way they avoid oxygen-free areas.

Thanks for mentioning this, Ric! Now I need to do more thinking ;-)


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Ric Seyler
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"RicSeyler" wrote in message ...
I think you are concerned about something that isn't really an issue.
In a reef tanks with a lot of powerheads, lights, pumps & flow, the
bottom of
the DSB couldn't be much of a different temp at all. I would imagine.
shrugs shoulders

You are probably right - I am goint to measure it with a thermometer anyway.

I would not worry about it.

If you wanted to experiment, you could try heating it and
see if you like it, but you would probably eventualy skip it.

If you heat it, nice and warm, you will increase
denitrification, because the increased warmth will
increase bacteria growth and resperation.

In the tropical environments, in warm water, the
temperature will be cooler as you go deaper in the sand.
It's like when you pull ground water up from a well in a
warm area, the water will be cooler. Here in Central
Florida, the well water is around 75 year round.

Down in deap ocean, the water is cold. I don't know of any
studdies of temperatures taken deep in the sand under the
ocean, other than hot vents.


Wayne Sallee
Wayne's Pets



Pszemol wrote on 1/30/2006 6:54 PM:
"RicSeyler" wrote in message
.. .

Never heard anything Pro or Con about lower level of DSP being a
different temp.
But you DO want that oxygen-free area at the bottom of the DSB.


Yes, oxygen-free is something different. I am talking about the
temperature.