So i added a blue carpet to my system a few weeks ago hoping my picasso pair would host. They wanted nothing to do with it. I have been told that a picture of a clown in an anemone placed on the side of the tank would help assist them in hosting. I found a picture in a friends son's school book, made a copy and placed it on the tank. I placed the picture on the side next to the anemone and sure enough within 10 mins the clowns were in! they havent left since! Ill post pics later.