After having my tank setup for 4+ years all 4 of my fish died within a week. I sent out a Triton water sample and everything came back good. I thought maybe disease and left the tank fallow for 6 weeks. My zoa polyps quit coming out for the first time in several years during this time. After 6 weeks I added a clown fish and royal gramma and both were dead within 24 hours. I added a orange monti digi at the same time and it was Dead and bone white within 24 hours as well. My last thought as to why was stray voltage. I tested with a multimeter and had over 5+ volts in the tank. I assume this is high enough to kill fish and coral? One by one I checked the equipment to see what was leaking voltage. Return pump was giving off 2.8 volts, heater was giving off 2 volts, mp10 giving off 1.3 volts. All of these were pieces of equipment that were bought with the tank originally and 4+ years old. I think I have solved my problem. Anybody else have any input or similar experience? I find it a little odd that almost every piece of equipment that touched the water was giving off stray voltage.