Give me some time I'm going down the list of aiptiasa now. But if anyone esle wants to look them up while my face falls asleep on my keyboard help yourself.
To me it looks like the common Aiptasia pallida
Family Aiptasiidae Carlgren, 1924
Genus Aiptasia Gosse, 1858
Aiptasia californica
Aiptasia carnea Andres, 1880
Aiptasia couchii (Cooks, 1851)
Aiptasia diaphana (Rapp, 1829)
Aiptasia insignis Carlgren, 1941
Aiptasia leiodactyla Pax, 1910
Aiptasia pallida (Verrill, 1864)
Aiptasia parva Carlgren, 1938
Aiptasia prima (Stephenson, 1918)
Aiptasia pulchella Carlgren, 1943
Aiptasia saxicola Andres, 1880
Aiptasia tagetes (Duchassaing and Michelotti, 1866)
Under a sub tribe we have these:
Family Aiptasiomorphidae
Genus Aiptasiomorpha Stephenson, 1920
Aiptasiomorpha elongata
Aiptasiomorpha luciae (Verrill, 1899)
Aiptasiomorpha minima (Stephenson, 1918)
Aiptasiomorpha mutabilis (Gravenhorst, 1831)
Aiptasiomorpha paxi Stephenson, 1920a