[Myka]

Originally Posted by Delphinus

30 ought to be OK, it's kind of on the threshold though, you don't really want it any higher IMO - but bear in mind that the speed of temperature change can sometimes be worse than the actual peak value itself - getting up there, and coming back down.

Fans aimed at the water surface to increase evaporation work really well to keep temperature in check.

Zactly.