Fri Oct 15, 2010 1:28 pm
You're going to reduce the amount of headspace available, as the outlet will not be at the apex. Other than that, you should be okay fermentation wise.
What you should be worried about is how you are going to do this safely with glass carboys. They are not designed for the weight to be on one "corner" like it would be when tilted. Not to mention how you are going to get a full carboy in and out of your fridge tilted at a 30 degree angle.