Hi Kuay5, Klien butterfly has indeed greatly reduced the aiptasia in my tank;
Cannot find small aiptasia anymore; and those big and medium ones are either getting smaller or retracted most of the time.
Also, it eats anything I feed him.
But it does nip my only SPS while it does not touch my zoas; or gsp coral.
I do not have LPS at the moment; so not sure it will touch LPS or not.