In considering electgrolysis/corrosion/wbx fishfarming a question  come
to mind.

Are the salmon necessary?

Why not the cutthroat trout. They are more agressive, and with the red
of the throat can be seen easier when making passage through the system,
so you know where they are to do their job, and they are much smaller
and can pass through the system more easily. Aggressive, they will be
easier to catch and with draw through the opening in the tank.

But better yet, why not  the sea run variety of  the famous Alaska Dolly
Parton?. Native to  Alaska waters, and 1st cousin of Alaska's  Dolly
Varden,  the Dolly Parton's are interestingly double breasted with
silver sides covered in  beautiful copper spots. You will often find
them amongst the other  mounts in the taxidermy and fishing gear shops
in Alaska.
Alaska King Salmon are taken in many Alaska Rivers, but the biggest
kings in the world grow in the Kenai River. The record taken there on a
flyrod weighed 97lbs, if memory serves. Like the Kings, the biggest
breasted Dolly Partons are also taken from the Kenai River. They could
be transplanted into the expansion tank for distribution.  Not only do
they return home to the point of origin, but  perhaps the copper could
help reduce the electrolysis. Although to reduce the electrolysis could
result in a hairy breasted Dolly!! When one is caught the  sight evokes
an extremely violent  emotional reaction in a fishermen. The sight tends
to derange the best fishermans mind.

Now, of course, if you plan on introducing the Dolly Parton  to your wbx
fishpen, keep in mind that it's a lot like raising Jackalo. You know,
those antlered jackrabbits in Wyoming that breed only when there is a
thunderstom, and only then during a lightening flash.

To catch the Dolly P.  you have got to be one fast fisherman!!

Good luck!!

John Rodgers
"88GL Driver ---who is REALLY glad it's Friday!!!!!!  -[ ;< )