What Heaters are You Running?

[H2o2]

I went to titanium even though they are more money and occasionally they fail but I have had 2-Pro 250 W bust open and take out almost all of my corals. It could have been a power spike but the titanium 1 I had was fine , so even if they fail they don’t crack open I hope and put what ever that stuff is into my tank.
They all make me nervous a bit like you said