hi there, i'm new to the saltwater scene, nearly done my cycle, but i was also interested in a blue carpet.... i saw on a site that they can grow to be 1 foot and 8 inches..... that is BIG.... it is also said to be one of the few anemones that can cause a severe reaction in humans, so keeping one requires care in handling. another site says that they require the following: "Bright lighting, normally four to six watts per gallon of water, will be important to help your Carpet Anemone maintain good health. Carpet Anemones normally do well in temperatures between 72 and 78 degrees Fahrenheit. The pH value should be 8.3 or 8.4. The specific gravity should measure at least 1.023. About once each week, trace element levels should be checked. Calcium and iodine may need to be replenished. Substrates of sand or coral rubble seem to work nicely for Carpet Anemones.Some Carpet Anemones may sting other corals, anemones, or fish that they are not hosting. Although Carpet Anemones normally do well as hosts for Clown Fish like Amphiprion percula and A. ocellaris, they can become harmful when their tentacles touch other inhabitants. With proper lighting, Carpet Anemones should not require any feeding. During the time your Carpet Anemone is acclimating itself to your aquarium, the presence of a Clown Fish may help. When purchasing a Carpet Anemone, choose a specimen with rich, even color. It should react to handling, and should be slightly sticky. This sticky feeling is actually the result of the stinging cells (nematocysts) firing into your skin. Most people will not notice any other effects but some people may have a reaction to this. It is also advisable to choose a Carpet Anemone that has attached itself to some object in the dealer's tank. " Sorry for the long post, but i thought you could use the info
hope this helps...