Temperature Fluctuation

[sitandwatch]

So I have been watching my temperature and it goes up and down during the day slowly...... So does this need to be addressed or is it just normal.

Here is the info
Start of day 8:00am 25.5c
End of the day 9:00 27.5c

Lights are on at 1:00 and off at 9:00

The temperature seems to just slowly climb up no big jumps

My house is going to be a hot box in the summer and I think that I will need a chiller at some point, I have a cooling fan but I am not running it right now.

Its a red sea max 34g

Thanks Brian