Anemones require really good lighting and a mature tank. There's always exceptions, but general advice is to wait until 9 months plus, so all the water chemistry, algae blooms, etc. are done.
They do move. Sometimes not for years, but it's always a risk. One many choose to take.
Clowns hosting is hit and miss. Some dive straight in, other take months/years before they do, some never go for it.