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