How much temp fluctuation allowed?

Just got the lighthouse controller and was wondering how much temp fluctuation is allowed? Heres the graph.

http://ibmgeek.dyndns.org/graphs.htm

Its not much only about 2 degrees but still curious.

 

Ideally the less flucuation you have in temp the better. Now with that being said my tank goes from 78 at night to 80/81 during the day.

 

Ok thanks. The lowest mine has gone is 80.5 and the highest is 82.2 so i guess ill be fine.

 

I would shoot for the 78 to 80 range or maybe 79 - 81 range. 82 is border line hot in my opinion...

 

Im going to have to buy either fans or leave the air in the house a little colder. Thanks for the suggestion.

 

I had to con Otty into coming over and installing two computer fans in my canopy. It got me down from 82/83 degrees to where I'm at now. I'm thinking about adding a clip on fan over my sump. They sell the clip on fans at Wally world, Lowe's, and Home Depot and they're not much. I'd start there if I were you.

Are you running an open top? Also what kind of lights?

 

Im running open top. Id imagine the temp is going up when i lower my lights 3 inches above the water (t5s) So i might get fans.