Today I had a perfect instance of why a controller could have saved the day. I had a heater go bad in my sump and tripped a breaker to my tank around 5 am and I didn't wake up and see it until 10am. There was zero flow in the tank and the temp was 71.9 - I was in full panic mode. It's been a rough day, a lot of my SPS look awful. Luckily I didn't lose any fish or lps corals. Not sure on SPS yet. The tank is cloudy and I'm trying to wait 24/48 hours before I make decisions on deaths of SPS.
It's hard bc I know if I would of had a controller once the temp drop 1 degree I could of saved my tank so much stress. To me 600 dollars to save $3000 worth of fish and coral is a no brainer.
I will be purchasing an apex as soon as financially possible.