I've been using room temp but with winter coming I've ordered a Fluval E to be on the safe side. The temp range seems quite wide what temp do most people use?

i've got 78 degrees F.

I keep mine at 78-80oF

my water remains at 27 deg celcius without heater. the heat coming from
the powerhead keeps the water temp constant. (additional benifit)

I prefer the temperatures to be around 27-28°C . My big tank is something like 25.9 today

mine seems to stay @ 78.5

25oC and I use no heater.
Summertime may run upto 29oC.
Winter is no problem, cause the tank is near my central heater.

no heater in the big tank at the moment, it's at 76 farenheit

im at 77 but i dont worry about winter even though my tank is 3' from the front door on the same wall but not in the direct line of the door and it runs just the same all the time.

25 C

Thanks for the replies. My unheated tank dropped to 23c over night which is colder than any of you keep yours. Think I'll heat to 25c, heater may come today as it was posted yesterday.

Just before winter my central heaters don't kick in yet, and then my temp dropps to 23oC as well, but all my fish handle that well for some time...