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incandescent spot lights, pH probes, laterite sources

> From: Phylesis <Phylesis at aol_com>

> 	So, no responce to my question on water. I spent an hour
> online last night searching through the Pet Warehouse catolog for
> Duplarite with no little amount of frustrstion and no product.Any
> other suggestions for a resource of laterite?

Daleco Master Breeder Products regularly carries Dupla.
Marine Monsters may also carry this.
Check http://www.cco.caltech.edu/~aquaria/Faq/plant-resources.html
for URLs to these & other places.  (You may have to follow the link
to the main resources page).

> From: Dan Q <dqallwet at avana_net>

> Interestingly,
> incandescent does work (be it wasteful in the long run). I have a 10
> gal. I play with in my office that has only a 65W incandescent bulb
> for lighting. There is an assortment of plants one of which is
> Riccia. I have Riccia in 8 tanks (and vats) which are lit by
> fluorescent. At best, the Riccia gets about 2" deep under the
> fluorescent. Under the incandescent, The Riccia is much thicker with
> the incandescent. Directly under the bulb it's 4 1/2 " deep.

Very interesting.  Do you think it's due more to the concentrating of
the light in one small area, or to the spectrum of the light itself?
65 watts over a subsection of a 10-gallon tank might be comparable to having
32 watts or more over the entire tank... 

I was in Vancouver this week & got to see some of Steve's killi tanks,
which used compact fluorescent tubes that are meant to replace
incandescents.  He had them in a reflecting fixture so that most of
the light was directed down in a cone.  Curious what testing one
side-by-side with an incandescent may reveal..

> From: Jim Wilson <freaks at aracnet_com>
> Subject: ESU Coralife pH Tester 

>  What's up with the calabration solutions: Do I need all 3
> (7.0 4.0 & 10.0) 

pH sensors usually do 2-point calibration, so the third solution is
not necessary. It's best to buy the solutions over the range you will
be measuring (I do the 4 and 7).

> Can I just use my tap water (7.0 -7.1 according to
> the city)for the 7.0 solution?

No. You don't really know what the pH is at a given time.  Your water might
come out of the tap with a pH of 8 because of the (lack of) CO2, and later
settles to 7.  You never know.  The buffer is a known quantity.

>  How long does a 4 oz bottle last?

Could last quite a while.  You might try a chemical supply place like
Hach, which sold me 16 oz bottles for quite reasonable prices.  Hach is listed
in the plant resources FAQ URL I quoted above.

  - Erik

Erik Olson				
eriko at wrq.com