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#1
03-10-2014, 03:55 AM
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Why were you checking? Noticing issues or were you geting zapped?
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360 gallon sps reef, 180 gal sump, bubble king supermarine 300, 4xmp40Wes, 2 x 6215 tunze waveboxes, 4 ghl mitras 360 Reef Tank 
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#2
03-10-2014, 04:03 AM
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Was seeing some of my LPS corals in the DT not expanding as much so I tested it and it was fine around 5. I thought while I am at it I might as well test the Frag tank and that's when I noticed it. I haven't seen any problems in the tank. No shocks.
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So many ideas, so little money!
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#3
03-10-2014, 04:07 AM
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Not super familiar with it but from what I was reading they don't seem to be concerned under 40v. How were you testing it? I am kinda curious now I know I had a bunch of stray voltage in one of my tanks before actually getting a shock found a bad ground inside of the outlet it was plugged into.
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360 gallon sps reef, 180 gal sump, bubble king supermarine 300, 4xmp40Wes, 2 x 6215 tunze waveboxes, 4 ghl mitras 360 Reef Tank
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#4
03-10-2014, 05:40 AM
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Voltage measured with a meter from a tank to ground is not necessarily an issue. It's when the voltage has a path to ground. This will result in current flow from the voltage source to ground. If something of lower resistance gets between the voltage & ground, that results in shock. Generally, if the electrics running your tank are plugged into a GFCI outlet, you'll be safe. While 30 volts is getting up there, there are many pitfalls when trying to measure voltage & current in salt water. If you're not getting zapped when touching the water & the livestock isn't acting weird, there shouldn't be cause for concern.
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Mike 77g sumpless SW DIY 10 watt multi-chip LED build  http://www.canreef.com/vbulletin/showthread.php?t=82206
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#6
03-10-2014, 10:13 PM
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My experience is that stray voltage is not good. I had a problem years ago with it. It wasn't enough to give me a shock but I noticed it when a cut on my finger was "buzzing" like putting a 9 volt battery on your tongue. I didn't measure the magnitude of the voltage but guessing it was under 20 volts. That was enough to cause slow death of corals and fish over several months. So I would be worried about it.
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#7
03-11-2014, 03:10 AM
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to be honest, I never really thought about it but, with all of the equipment in a small space the possibility is always there.
I installed a $9 grounding probe I picked up in a recent order from J & L. I just grounded my sump, not the display tank since it's just a holder of the water and nothing is submerged on the DT.
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130 Gal Community Planted Tank and a 250Gal Peninsula FOWLR
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