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Trace element mix, shrimp, green water

Hi all,

I've been saving up questions for a while to ask all at once.  Here goes:

1.  I'm trying to find some trace element mix for making PMDD.  I found
some stuff here in Houston called Peters STEM (soluble trace element mix).
It has pretty much the same ingredients as most of the other trace element
mixes I've heard of here and at the Krib, except the Cu concentration is
2.3% -- about 20 times what was in the mix in the original Sears & Conlin
paper.  (This is relative to a Fe concetration of 7.5%, BTW.)

I know that at high concentrations copper can be toxic.  Is this amount
likely to be harmful?

2.  Apparently the shrimp like Amano uses are making the rounds here in the
US; I just got some locally (at Village Tropical, for you Houstonians).
These are the larger shrimp, not bee shrimp (I think -- haven't nailed down
the scientific name).  Anyway, I put four in my 30 gal and six in my 55.
The ones in the 55 have been quite active, swimming around and eating
stuff.  There's no obvious dent in the algae yet, but there's a heck of a
lot of it in there, probably much more than 6 shrimp can handle.  In the
30, however, I've hardly seen hide nor hair of them, and when I do see them
they are quite still.  Not dead, apparently, because they don't stay in the
same spot.

The big difference in the two is that while the 55 has quite clear water,
the 30 is in a window and has pretty bad green water.  Does anyone know if
some shrimp are filter feeders?  Maybe they have enough food from the water
not to have to scrounge for algae.

3)  Speaking of green water, I heard on this list at one point that someone
tried putting daphnia in the tank, inside a very fine-mesh net, in order to
clear the water.  Does this work?



Chetlen Crossnoe
Baylor College of Medicine
Structural and Computational Biology and Molecular Biophysics
cc691077 at bcm_tmc.edu
"The gods themselves are not for ever glad.  The ineffaceable, sad
birthmark in the brow of man, is but the stamp of sorrow in the signers."