How bad are temp fluctuations?

My tank is relatively new and I've had issues keeping a constant temp. I'm using T5 lights with a fan that runs 24-7. I find that during the day the temp gets up to 81 degrees F and at night down to 78 or maybe even 77 degrees. Is a 3 or 4 degree difference in temp in a 24 hour time period going to effect the health of my corals??

Thanks

 

my tanks goes from 77 in the am to 81 at night back down to 77 around midnight every day with out any problems

 

BTB whats your coral stocking???? Softies, lps, sps?

 

why are ur lights running 24-7?

 

I beleive he just meant his fan... i hope

 

hahah pretty sure he ment his fans run 24/7

 

lol, yes I meant the fan. The actinics and 10,000k bulbs are on timers but I don't have space for the fan on the timed outlet so it runs all the time. I have softies, some lps, and some sps (sps is only 2 small frags of montipora).

 

ah i see...well the way it was spelled it couldve meant what i was thinking. either way why are ur fans running 24/7? the temp swing is normal. the fans wont be doing much (for the positive at least) once the lights go out. we usually only run fans when the lights are on to disipate heat correct? what temp is the room that the tank is in?

 

see previous post

75 degrees

 

my tank goes from 78 to 82 every day and all seems well.