Glad to hear you got the set-up. It's a nifty little tank. Whisper makes a small heater (25 watts, I believe) I've seen them at the Pet*s and also at Walmart. I use a 50 watt submersible diagonally in my 2.5 and it fits fine. If you happen to see them, those little "bullet" heaters don't really work very well and you cannot regulate what temp they are putting out, so you're much better off getting the Whisper or similar submersible. 
What Tom mentions about keeping the filter on the other tank is really the best way to go. I am very nervous when I hear people keeping qts cycled with other fish -- this practice is fraught with problems from exposing the established fish to nasties to the inevitable mini-cycle or worse possible if the introduced fish causes enough of a jump in bioload and beyond. This is why I only use sterilizable or disposable stuff in my qt -- I never want to have regrets if the worst should happen.
I should mention, when I was new, I added fish and swapped them around with impunity and never lost one to a cycle and only a couple to disease. After I became more experienced and learned the science as well as the hobby and had drilled into me that one must always quarantine, I always quarantined until one time last summer -- that particular situation led me to need to introduce fish suddenly and I admittedly took the easy way since the source was well known and consistently reliable to me in the past -- end result: I lost around 3/4 of my pond fish within a 2 week period. All of the small fish as well as the large and many medium. Some of these fish were 10 yr old friends who would feed from my hand. Lightning strikes when we least expect it and there I was with lightening rods within reasonably easy grasp, all things considered. Never again.
What Tom mentions about keeping the filter on the other tank is really the best way to go. I am very nervous when I hear people keeping qts cycled with other fish -- this practice is fraught with problems from exposing the established fish to nasties to the inevitable mini-cycle or worse possible if the introduced fish causes enough of a jump in bioload and beyond. This is why I only use sterilizable or disposable stuff in my qt -- I never want to have regrets if the worst should happen.
I should mention, when I was new, I added fish and swapped them around with impunity and never lost one to a cycle and only a couple to disease. After I became more experienced and learned the science as well as the hobby and had drilled into me that one must always quarantine, I always quarantined until one time last summer -- that particular situation led me to need to introduce fish suddenly and I admittedly took the easy way since the source was well known and consistently reliable to me in the past -- end result: I lost around 3/4 of my pond fish within a 2 week period. All of the small fish as well as the large and many medium. Some of these fish were 10 yr old friends who would feed from my hand. Lightning strikes when we least expect it and there I was with lightening rods within reasonably easy grasp, all things considered. Never again.
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