[RML] popeye

Peter Unmack (peter.lists at)
Sun, 4 Dec 2005 09:03:44 -0600 (CST)

G'day folks

I've noticed now for the second time after I have done a water change that
a couple of my fish have developed "popeye" rather suddently, which makes
it pretty likely that something about my water is causing a problem rather
than it being a bacterial outbreak (although maybe stress from a water
change could trigger it, but overnight seems a bit too quick for
something bacterial?).

So all of my water is aged usually a couple of days with a large air stone
in the same room as all of my fish, thus water temperature should be
pretty similar. I usually do >80% water changes. And I usually refill
the tanks over an 30-60 minutes or so. I usually just dip a five gallon
bucket in my water containers and pour it into the fishtank moderately
vigorously. There are never any signs of air bubbles, or anything else
unusual. This is the same way I have been doing things at the same place
for 2-3 years. Only one species has been a problem, fathead minnow, but
I've had them in the lab for 4 months or so without any similar incidents
until last week and this week.

Anyone got any clues as to what is going on, and what I might do to
prevent this reoccurring? I searched around online and found a variety of
information about it (quite conflicting too of course). But saw little
about water changes, except that sometimes water that hasn't degassed can
cause a problem, but you should see lots of bubbles on the sides of the
aquarium, which I never have.

Peter Unmack