Ideal Temperature For My Tank?

[rolltide101x]

I have
Cory Dora Catfish http/www.petsmart.com/product/index.jsp?productId=3955210&lmdn=Pet+Type
Red Wag Platy http/www.petsmart.com/product/index.jsp?productId=3955280
Red Fin Minor Tetra http/www.petsmart.com/product/index.jsp?productId=3955268
Skirt Tetra http/www.petsmart.com/product/index.jsp?productId=3954144

I got a aquarium heater today what temperature should I try to maintain in my aquarium/

I know petsmart's website says the temperatures but they are wrong about almost everything... So I thought I should ask

 

[soybean]

About 75-77 F.

 

[rolltide101x]

Thank You!