Temperature for tank

[fishygurl]

I was wondering what temperature i should keep my tank at. Right now it is at 26 degrees C. I have only 2 dwarf gouramis in there right now and they seem happy. I am planning to eventually keep cherry barbs zebra danios and peppered cories. I am aware that the barbs and gouramis prefer higher temperatures than the other, but i need to find a temperature that suits everybody. What would be the optimal temperature for my tank?

 

[Lonewolfblue]

26 is perfect. Mine goes between 26 and 27 in my 26G.