Originally Posted by Sqasnatch
It's a 12 bulb aquatic life with built in fans and blue night led
,s can I put the current meter right in the water to test it. And does that mean it is the fixture or just that I'm grounding on the fixture and getting zapped, also why does nothing in the tank seem affected
Its hard to say where the stray current is vs. the ground.
You have to figure that out either using a GFCI with a trip button or a volt meter.
Touch the probe to the water or to the light fixture and you should see a reading. If its in the water, then one of your pieces of equipment has stray current, and your light fixture is the ground. When you body touch both at the same time, you are the conductor for the current, which is why you get zapped.