[mike31154]

How's your livestock, looking good? If so then there is no problem other than you chasing numbers measuring voltage in your tank water. Voltage up to about 40 is unlikely to give you a shock or harm you or your livestock. Anything metal in your water has the potential to introduce a measurable voltage. Even lights may induce voltage in the water, fluorescents being the most likely due to the electromagnetic field produced by the tubes.

Grounding the tank may not only mask the 'problem' but also make it worse, turning the static voltage you are measuring into current flowing to the ground probe. The only thing with an electrical cord in my tank are heaters and a small pump delivering water to my skimmer. If I need to know my pH, I use a test kit. Water movement is by EcoTech pumps with electric cord outside. I don't use a controller, so can't really advise on what may be up with your Profilux.