Saddles get huge - up to a good 1.5' across easily. They can and will out-sting other anemones and corals. Carpets also require very intense lighting, either via lots of PC or MH bulbs. Finally, like the other "carpet" anemones, they are also quite adept at catching careless fish that wander into them. If you absolutely MUST get an anemone (and you have the means to care for one), stick with safer choices like the bubbletip and sebae anemones, which are accepted by a much wider range of clownfish species than the saddle.