what's your tank temp running at ?

[Xtasia]

I wouldn't let it go higher than 83. 86 at the absolute highest.

If possible keep it within 3 degrees of your current temperature. Ocean temps do not change more than 1 degree a day apparently, so we should try to aim for stability. Any time you bring your temp down you won't want to do it too quick.

I've got my lights on a reverse cycle over the summer. They come on at 2am and go out at 10am. Actinics are on from 6-12 so that I can see the tank when I'm home from work. This way the hot MH lights are on at the coolest part of the day. My temp range is 77-80 using this method. So far, I haven't needed to use any other method to cool the tank.

You can also use fans, small water changes, and clean pop bottles of frozen RO to chill it. I've considered frozen cubes of Ro water for top off... holding it in the tank and letting it dissolve cube by cube.

[TheReefGeek]

I have heard of tanks hitting 85 for a while without any ill effects, so 86 sounds like a decent "max".

Anything over 80 and I would panic, because my tank temp doesn't ever go over 78.

[Manny]

This morning my tank was only 77.1 I still have no heater or livestock in my tank so it really does not matter what it goes to, but I would rather it be too cold than too warm

[rickjames]

My tank has been fluctuating between 82 in the morning and 84 in the evening. Normal temp is 78-81. No ill effects yet... other then corals growing very quickly

I have heard of one tank fluctuating between 79-89 everyday..