dark period 1 degree over light period

hey everyone.ive just started my indoor grow with of 4 plants under 400w hps.ive got my lamp running at night time as im down under and its to hot through the day to run it..basically it sits at 31 degrees through the day in the plants dark period and when night comes it sits at around 30 to 32 tops never over.i have fans running with fresh air vented in 24/7 and out.will this stuff anything up as the plants are growing super quick and healthy as at 6 weeks in to veg from seed.i know there should be a temp swing from day to night but in my case the plants dark period is roughly 1 degree above the light on temps.is this a big problem as there going excellent.any help or advise would be great.thanks a million everyone.cheers .also im talking degrees celcius not farenheight.thanks

ive put this in the wrong forum i think .im sorry to all you greenthumbs