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Aquatic Plants Digest V2 #59

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Aquatic Plants Digest        Thursday, 9 May 1996        Volume 02 : Number 059

In this issue:

	valves
	Re: Halogen question.
	Re: Aquatic Plants Digest V2 #57
	the halogen torchier
	Need digest V2 #51
	Rotala Leaves

See the end of the digest for information on subscribing to the
Aquatic Plants mailing list and on how to retrieve back issues.

----------------------------------------------------------------------

From: Henrik Pedersen <valve at dk-online_dk>
Date: Wed, 08 May 96 22:55:57 -0700
Subject: valves

what do you know about valves ?

------------------------------

From: RTalukdar at mail_utexas.edu (Roni Talukdar)
Date: Wed, 8 May 1996 17:15:56 -0500
Subject: Re: Halogen question.

John,

>I was talking to a person on the net and they told me that they use a
>halogen torchier lamp with adjustable brightness to light their tank.  They
>dismantled the lamp they bought, and then hung like a pendant light.  I
>thought it may be a very good idea.  Is it?  Is halogen a effective light
>for plants?  It would be very bright!  A possible cheap substitute for metal
>haldide?   


Halogen lights are a very inefficient energy source.  Though they seem like
a great deal (only about $20 for everything), the amount of light they put
is small compared to the wattage they consume.  I remember someone saying
that a 500W halogen wasn't even equal to a 175 W MH.  You'll pay in the long
run with higher electricity bills.  Also, the spectra that most halogen are
available in are not too pleasing to the eye, IMHO.  You would be better off
using a 4 bulb T8 flourescent ballast with 4 of the daylight bulbs.
Probably get as much light for only 128 W and the whole thing will only cost
about $60-$70.  

- -Roni




------------------------------

From: Bob Hoffman <bhoffman at deltanet_com>
Date: Wed, 08 May 1996 18:01:17 -0700
Subject: Re: Aquatic Plants Digest V2 #57

> 
> From: Elizabeth Worobel <eworobe at cc_UManitoba.CA>
> Date: Tue, 7 May 1996 21:46:36 -0500 (CDT)
> Subject: Re: Activated Charcoal
> 
> Several people have asked about the chemistry of activated charcoal.
> Activated charcoal is made by burning wood or bone. It is therefore a
> complex mixture of many different types of organic compounds and
> minerals. It is likely that polycyclic aromatic hydrocarbons make up a
> significant portion of the charcoal (benzene is an aromatic hydrocarbon
> ... if you combine lots of them together they become polycyclic). The
> chacoal is 'activated' by being heated to a very high temperature in
> order to drive off the water molecules. This complex substance will bind
> anything that is hydrated in its natural state. This includes iron,
> chelated iron, other cations and organic compounds. The binding occurs
> through ionic interactions, hydrogen bonding, and also through Van der
> Waals forces (though Im told covalent bonding is unlikely). Substances
> which are bound by these forces are in equilibrium and can return to the
> 'free' state so that a saturated carbon filter should still selectively
> remove substances which bind more tightly to the charcoal matrix.
> In practical terms what this means is that carbon filters should not be
> used in a plant tank which receives regular additions of micronutrients
> (if you want to maximize the effectiveness of your micronutrients).
> I have recently removed my carbon filter and have noticed an increase in
> plant growth, though this anecdotal evidence is hardly conclusive. One
> concern is that the load of organic compounds (such as urea etc) in the tank
> could increase to toxic levels, though with lots of plants and few fish
> in the typical plant tank this may not be a problem ... something to
> think about.
> 
> Dr. dave.
> 

I think with routine partial water changes the need for carbon is 
eliminated and the build up of any toxic or other harmful substances are 
unlikely to occur as well.

Bob Hoffman
Huntington Beach, CA USA

------------------------------

From: JDAVIS at bio_tamu.edu
Date: Wed, 8 May 1996 20:53:22 -0600
Subject: the halogen torchier

I experimented using a halogen light on one of my tanks for a while.  I 
found that:

	1.  It was very hot and threw off a whole lot of heat
	2.  The color was VERY warm and everything looks quite yellow.
	3.  The light was very expensive to run (both in electricity and in 			    	  
     blown light bulbs.

I was not happy with the experience, but if it is working for someone 
then it must work...just not for me.  I didn;t use a torchier...i used 
an outdoors halogen fixture mounted on the wall behind the aquarium.


    John Davis (marooned in aggieland)
    Department of Biology
    http://http.tamu.edu:8000/~jmd9261
    jdavis at bio_tamu.edu
    jmd9261 at tam2000_tamu.edu
  
- ----------oOOo----oOOo-------------------------------------------------


------------------------------

From: KB Koh <KB_Koh at ccm_ipn.intel.com>
Date: Thu, 09 May 96 09:51:00 PDT
Subject: Need digest V2 #51

Hi,

Could someone please send me digest v2 #51. I did not received it.
Thanks.

rgds..kbkoh

------------------------------

From: "Clayton L. Workman" <cworkman at quapaw_astate.edu>
Date: Thu, 9 May 1996 00:39:49 -0500 (CDT)
Subject: Rotala Leaves

Hi all!

I bought some rotala cuttings a couple of weeks ago.  It a beautiful 
plant and I love it, but something strange is happening.

The plant had small roundish leaves when I got it.  It still has those 
same leaves, but the new leaves (which are many) that have grown as the 
plant has grown since I've had it are long, slender leaves - nothing like 
the leaves that were grown on it already.

Can anybody tell me why this is happening?  I really like the original 
leaves a little better and the plant looks funny with the two different 
kinds.  (Yes, the whole plant is under water.)

TIA
Clayton

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------------------------------

End of Aquatic Plants Digest V2 #59
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