Our power supply at home is a 3-phase 220VAC.
AC means alternating current. Meaning the current flows back and forth.
In the pumps, the AC is often rectified into a DC which means direct current. This current goes in a single direction. Whether AC or DC, water and electricity should never mix.
Grounding probes would not help. It's just a band aid. Plus it's very very dangerous.
When I was at Iwarna last week, the light above the tank was leaking current, the water have me a shock!
The light was not even touching the water but current was getting in.
Suggest that you turn everything thing off bro. Including all lights and wavemakers.
Then slowly one by one switch on. Before turning on the next one, test the water for tingling sensation first.
Just my two cents. Hope this helps