Rick,

I guess I missed that all fish even in different tanks have the same
problem. I would suspect as others do a water issue. Without going back
and
reading all the posts, do you use a python or similar system and add water
direct from the tap which you have used a dechlorinator on?. It may be a
high concentration of dissolved gas in the water that is irritating them.
I
have 3 large plastic garbage bins (with 36 tanks that is not enough) that
my
waste water from my R/O system goes into. I use a bubbler and heater in
those containers which keeps the temp. close to tank water but more
importantly removes the gas and chlorine from the water. Possibly check
with
you water supplier to see if anything different has been added recently.

Heh, yeah, I was hauling five gallon buckets downstairs for my 50 gallon.
For my 125 gallon, I installed a sink downstairs and purchased a python
system. I was concerned about not being able to treat the water before
putting it in the tank. But I should point out that I have seen the same
symptoms in the past when I put the dechlorinator in the bucket and let it
sit a few minutes before pouring it into the tank.

Yeah, I definitely worried about something in the water that I can't
measure. But it's not a matter of what may have been added to the water
recently as the problem has existed ever since my first fish.

I will consider the possibility of buying a plastic garbage bin though. I
should have no trouble storing the water needed for a 25-50% water change in
it for a couple of days. Not sure what the R/O refers to. But I suspect I
can find some way to transfer the water from the garbage bin to the tank.

Thanks.

Jonathan