No probe here. Been running a tank for over 10 years.
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If their is voltage in your tank the livestock would never know because they are not grounded.I haven't noticed anything unusual with fish, inverts or corals. Out of curiosity, I just pulled out the multimeter and tested my tank......4.4 volts. And this tank has been running since 2008 with three original fish.
In England we have 240volts but all items are double sealed if they don't have a earth wire in our 3 pin plugs but my house uses a residual circuit breaker (RCD.RCB) if one wire gets damaged the draw on the wires is uneven and shuts off the power. Very safe systemQuestion: Do you use a grounding probe? Yes/No
If you feel like giving more detail that is always appreciated!
Do you use one in DT and sump?
Where did you place it?
What brand?
In your case GFCI would protect you.OK, I had a tank crash on top of me all because of a heater that was shorted out. With that current going through you, you can't really let go of things....your stuck in a grasping situation. Ended up in the urgent care, stitches, electrocution, and two weeks of missed work....I highly recommend them as for every tank I set up will now have them in it
In your case GFCI would protect you.
I don't have grounding probe. I run all my equipment from GFCI. Only 24V return pump runs on separate non GFCI outlet
Yes, I use one on both of our tanks.....Here are some details from a test I witnessed at a reef club meeting a couple years back:
GFCIs and ground probes work together. Here's a test that proves it... Connect a power cord with hot and neutral to two probes and pierce them into a pickle. Plug this into a standard GFCI receptacle. The pickle will sizzle and actually light up and the GFCI will not trip. Now run the same test with a ground probe plugged into the GFCI and probe pierced into the pickle. The GFCI trips instantly. I saw this at a reef club meeting. Also, do not hold the pickle during the test!


Could some of you please elaborate on the reasons why you do or don't or at least post a link with the information you are basing your opinion on? Also, if you do use one, where do you put it and why there? Thanks from one who is clueless that there was even a dispute about it. This would be helpful.

I have a ground probe in my tank and have had it for 20 years.
I have it because if there is a potential current leak from an exposed device like a broken heater, I want the GFCI to trip immediately instead of waiting for me or someone else to touch the water and provide a ground through my body. Not only do I not want to provide the current path with my body, but I do not want exposed wires contacting the water out of concern over copper and other metals.
Simple as that.
FWIW, my system is fairly extended, and I have one in the display and one in the sump since they may not always be electrically connected, especially in an emergency. That has its own issues with respect to possible currents, but I know they are both connected to the same ground.

