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Limpets, PMDD and Tap Water, & EDTA photodegredation

> Date: Mon, 17 Mar 1997 22:27:58 +0000 (   )
> From: "Roger S. Miller" <rgrmill at rt66_com>
> To: aquatic-plants at actwin_com
> ...SNIP...
> On an (I think) unrelated note, I recently found little (3 mm long)
> limpets in this tank.  They look something like scale that you might find
> on fruit trees, but they move about and from the bottom they look rather
> like snails.  Are these guys a problem?  Marine limpets are all algal
> grazers as near as I can tell, but I haven't been able to find much about
> freshwater limpets. 
> Roger Miller

I too have freshwater limpets in my tank.  I noticed them more before I
moved up in tank size... I must have killed a bunch when I changed
tanks.  Anyhow, I talked to an invertebrate specialist at the aquarium,
and found out that it was normal.  Treat them like snails.  Though they
don't get big (not that I've seen).  Also, if you have a lot of snails
in your tank, they seem to out-compete them.  Ever since I introduced
MLB & RAMs to my tank, I don't spot them.

> From: "K & A, P.A." <kapa at netrunner_net>
> To: Aquatic-Plants at ActWin_com
> Subject: PMDD Question
> Hi All!
> I've decided to give the PMDD a try.  One question that concerns me is
> should I use tap water with my tank.  Will the chemicals present in my
> tap water chance the standard PMDD formula?
> I'd appreciate any help.
> TIA,
> Art Giacosa/ Miami, Florida

I've been using PMDD for a little while now, and have made my batch with
tap water.  I'm no chemist, but I think that it will only alter it a
little.  Still much better and cheaper than commercial products.

> From: Craig Bingman <cbingman at netcom_com>
> Date: Tue, 18 Mar 1997 14:19:55 -0800 (PST)
> Subject: Re: EDTA and light
> under a UV lamp, sure, it will probably degrade.  Many suppliers sell 
> EDTA in natural polyethylene containers.
> Yes, light is pumping redox chemistry in the case of Fe:EDTA.
> Relevance to planted tanks:  PMDD and other solutions containing Fe:EDTA 
> should be stored in the dark, or at least in amber containers.  If chem 
> whiz kids on this list make a stock of sodium EDTA, it is perfectly 
> stable in clear glass or plastic, at room temp, in the light.  Solutions 
> of EDTA and any transition metal should be stored in the dark.  
> Craig

Since you mention that SOLUTIONS containing Fe:EDTA should be stored in
the dark, that raised a question for me.  What about degredation of
Fe:EDTA in powder.  Does the powder also need to be stored in the dark
to avoid degredation? 


pearlsco at u_washington.edu
The more people I meet, the more I like my plants.