Grounding probes and pH electrodes
Having recently set up a fully automatic CO2 system on a 110 gal. tank and
be completely dumbfounded as to why my pH meter/controller would go crazy as
soon as I dropped its probe into my aquarium, I can say that those aquarium
grounding probes can be essential as long as they are connected to a good
ground (water pipes are the best).
Apparently both me pumps (an eheim and a quiet one) were sending
electricity into the aqaurium and the pH electrode was attracting quite a bit
of it, making my meter go bonkers.