Oh yeah, I almost forgot...Anemones will move around the tank until they find a spot that suits them waterflow wise and light wise and you will need some intense lighting for them.
In a 14 gallon Bio-Cube, even a Bubble Tip will turn it into a species only tank as they can easily reach about 12-14 inches in span when about a year old and inflated fully and will sting the be-jesus out of anything it touches. A Carpet Anemone as beautiful as they look can attain the size of a couple of feet if it lives long enough in your tank just to give you an idea. That being the case I would pass on that idea until you can get a 40 gallon breeder sized tank or bigger.
There are many substitutes for an Anemone in your tank if you want to experience the Clown Fish Host experience. Xenia and Anthellia are just a couple of corals that are very conducive for this purpose. Others that I have used if they are large speciemens are Hammer Corals, Torch Corals, Grape Corals, Toadstool Leathers (long polyp) and GSP. If Mr Clown Fish has a bit of a problem figureing it out you can use a trick I have used in the past and print out a picture of a Clown hosting on an Anemone and tape it to the side of the tank close to the coral and they will pull a "Monkey see - Monkey do" for you after a while. It sounds stupid, but it does work!