3-4 Volts okay?

You can pick one up pretty cheap at Sears or Lows or something for like $10. I have a $400 meter but it is more precise for the line of work I am in. I picked up a cheap craftsman digital multi-meter for around the house at Sears for around $10-$15.

 

no a grounding probe won't do that (AFAIK)

A grounding probe will keep *you* from getting shocked when you put your hand in.

If you want to lower the volts, you have to remove/repair the equipment that is introducing the volts. per my understanding...

 

I got mine at walmart last night for 16 bucks

Multimeter

 

For around the house, cheap ones work fine (and if you lose it, who cares )

 

They're building artificial reefs in Dubai and are actually introducing current in the structure to help the corals grow.

 

there was a really good post here a weekish ago about stray voltage. i never read the end result. but someone brought up a good point

Voltage is potential energy, so if everything in the tank has the same "voltage: then it wouldnt ever really do anything

current is the transfer of energy so something like a grounding probe in a system with voltage present would cause current. current is what i would guess cause problems.

you would have to use an ammeter of ammeter fuction on a multimeter to measure current in the tank.

i am going to search for that thread now.