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.
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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