Absolutley too big for a home tank IMO
. I had a long tentacle that was getting too big for my 125 before it sudenly died. No more anemones for me. Most should be left in the sea where they can live long (very long) lives as opposed to the typical 6 months to a couple of years in our tanks.
My clowns were frantic when the anemone died but ended up settling in a hammer and are quite content with that.
If you absolutely have to have an anemone, do a google search for "clown fish and anemones"....
Anemones and Clown Fish
and Clownfish Host Anemones
for a list of which anemones are most likely to host which clown fish.