What is the highest temp a reef tank can reach b4 a problem?

[JustAnt]

My tank is already up to 80 degrees Fahrenheit with my AC running and it suppose to get much hotter today so wondering at what point to worry

 

[Subsea]

I suppose it depends on what’s in your tank. I see no problem with peaking at 85.

 

[brandon429]

Agreed they tolerate shockingly high temps but the system begins to produce lots of extra floc and needs + export as all systems are running much faster than normal at those temps, the oxygen delivery of the square box is set to X by ambient params/system design and then upping the temp above 80 is the number one thing that lowers oxygen and increases castings and life/death cycles for the microbes but they stay alive. Working with a friend right now in the Philippines whose tank routinely gets to 88-90

 

[Kevin Beadle]

My tank runs at 82 to 83.5 I haven't noticed an issues over the past year