Quick question on Rez/Control Bucket Temps

OK so during their noon feeding i took the temp in the buckets directly. 77.2°F Res temp was 67.4. Sooooo that being said, any ideas, thoughts, or maybe pie?
Do I need to work the res temp lower?
A few more things to know, i have some extra (not much) black hose for each bucket for expansion, grow baby grow, Control bucket temp was about the same as it was mid-feed.
It just finished feeding a minute ago and res temp was 68.9°F so I would assume (yeah I know) that the bucket temp had to be close to that as it just filled and drained.
They are beginning to spread a bit so what can I say but YIPEEE!!
So far so good. Thanks to all for the info and help.
Buz
PS any one got a good recipe for Pot Pie????

If outdoor temps affect your grow room temp you can shift your light cycles to be off during the hotter times of the day. I'm using 14 hour light cycles from 9pm to 11am so the plants are dark in the hotter times of the day