I tripped a breaker

So I am sitting in my basement watching my fish as they were watching me and all of a sudden the lights go out. I was an electrician for 40 years and I can count on one hand how many times my circuit breaker tripped in my house while I was not doing anything like leaf blowing, arc welding or running some heavy equipment. So I look around and I was mixing up some saltwater and in that 30 gallon tub I have a powerhead and 3 heaters.

So before I turn back the breaker I figured it must be one of the heaters. It's always a heater. So I lift one and it is fine, I lift the second one and it is fine. Then I remove the third one and it is all black and scurvy inside and it is full of water. As I am looking for a crack on the glass, it dawned on me. The crack wasn't in the glass, it was in my head. That heater was "not" a submersible heater. It used to have a bracket on the side to hang it on the side of the tank. Like Duh. I have like 8 heaters and I just pick out a few, plug them in and throw them in a tub of water. I should have realized it wasn't submersible when it floated. I even got a big 1/2' nut and rubber banded it to the thing to keep it underwater.

It's just great getting old.

So now I have a spare, large test tube that I can make a really small Nano tank out of :doh: