The only anemone that a clownfish will host every time is H. Magnifica. It gets to be at minimum 1 foot wide and takes a lot of water volume to deal with the excessive amounts of waste this beast of an anemone puts off.
To begin with, what size tank do you have? What is your filtration? Do you protein skim your tank? What are your water parameters including nitrate, phosphate, alkalinity and pH? Last, but arguably most important - what lighting do you have?
All of these questions become factors in an equasion to determine if your tank can have an anemone.