Ecotech is has been pretty good about replacing failed out of warranty magnets IME.
How many people here are running lids and what do you consider an ideal tank temperature? My tank is barely running the heater, if at all, and yet runs a bit warmer than I’d like during parts of the day (79* F).
I always run lids unless it’s a hot area then I prefer net top. I run my tank at 76 so as to save on heating costs and it isn’t broken so I dont fix it. I think stability is inherently key for temp with a fairly wide range of acceptable temperature.
If you are going for max fish/coral growth then likely closer to 80 would be smart I have a hunch, but I’m definitely not running any races...
I also keep my temp a little lower so as to maybe slightly reduce the food needs of, and possible aggression between, my 5 large tangs.