bad idea This is the time when you need to be getting your water conditioned for the fish, get your pumps and filters running, do all your water adjusting, get your PH where you want it, get your General hardness and Carbonate hardness set, make sure all leaks and plumbing are running correctly. Don't rush in adding fish, If anything start looking at purchasing plants first, you have plenty of time to add fish when all is set and ready to go. right now is the easiest time to get water all in the correct parameters as there are no fish so you can adjust everything fairly quickly and easily with no ill effeects or shock to the fish. Plus if there is a issue that needs addressing then you don't have to worry about what to do with the fish while you fix the issue.