First of all...nanos are very difficult to keep. The smaller the tank size, the more difficult it is to keep healthy. This is because the water peramiters can change very quickly (i.e.) ph, temp, ammonia, nitrates, nitrites, etc. One little thing and all is lost. Marine animals, especially anemones do not like change; it stresses them. Anmones also need high quality lighting and perfect H20 condtions. But if you are one of those people (like me) that want to find out for yourself, your tank needs to be set up a minium of 5-6 months before adding this creature.