okay, for scaleless, i have a 2ft clownknife, a 2 & 1/2' Marble Pim Cat, a 1 & 1/2' Fire Eel. The Argulus are only on my 3ft Arowana (that i can see, the scaleless stay well hidden). so as you can see, these are LARGE fish, so picking argulus off is not really an option. however, i am off...