On Mon, 13 Feb 2006 03:58:09 GMT, George Patterson
wrote:

wrote:

I have a yellow tailed blue damsel that appears to have lost all of
the blue coloring (scales?) at the top of his head and around his
eyes. So he's mostly blue, but black in that area.

Electrical leakage into the tank can cause this sort of thing. If all your
submerged equipment is on a GFCI outlet, this is almost certainly not the cause.
If you don't have a GFCI, get one. If it trips, unplug equipment and reset until
it doesn't trip. Replace the last item you unplugged.

If this is the cause, the scales may not regrow, but the fish will be ok.

George Patterson
Coffee is only a way of stealing time that should by rights belong to
your slightly older self.

George,

All tank equipment is on a GFCI outlet. However, I live in an old
house. Most of the circuits are knob and tube style wiring. The
tank's circuit, as well as a few others, are updated wiring, but the
electrical panel is not grounded to anything. Is my GFCI useless?
What about a grounding probe? And is this the most likely cause of
the problem. Thanks for your input.

Grant