Anything higher than a 25w would ideally need to be on a dimming stat in a 2ft viv. If it's in a cold room you may get away with a 40w in there but it'd be risky in such a small viv.
As long as the air temp is in the mid-high 70'sF I wouldn't worry.
You've got the heat mat/stat so you can give a properly controlled warm area that way - for a corn all the bulb really needs to be doing is just boosting the air temp by a few degrees.
As long as the air temp is in the mid-high 70'sF I wouldn't worry.
You've got the heat mat/stat so you can give a properly controlled warm area that way - for a corn all the bulb really needs to be doing is just boosting the air temp by a few degrees.