GFCI saves life... Grounding probe is designed just to keep
your fish from getting sick from stray voltages - but I guess
it is only a marketing thing rather than a real deal... because
the real thing is that grounding probe is making things worse
for your fish. It creates stray currents which are far worse
than stray voltages for a living things. But this is only IMHO.
I would be happy to hear from you about grounding probe saving
lives... please explain how does it do it?

it saves the lives of my blue spot stingray

i went through a un commented number of them after I got my first, the tank is outside,
and they would not do well, I bought that tank used, with the ray, it took only a few days
to kill it, and the next ...... there was very very little stray voltage leaking from
something but it was bothering him, now the probe, and cooler temps and ive been keeping
the same one for a while ill have to dig out dates but I think its over a year now.

I would suspect that a grounding probe **WITH** a GFCI would do a good job at sending that
stray current away from the guy with his hand in his tank, between the time that the shock
occurs and the GFCI trips, but read into that third word suspect in this statement as I
have no proof either way. just seems the probe is a much less resistant path then a guy
with his arm in a tank

--
richard reynolds