Thanks for the advice.This is not a proper diet. With other two doing well, Observe them as after 3 months, this is not a matter of quarantine but rather husbandry. Add foods to diet such as LRS fish frenzy, plankton and even flakes such as Formula one. The weight loss can be as simple as aggression in which one or both clowns are depriving it of eating often associated with clownfish hierarchy in which one will steal all the food. chase it and push the fish to a corner of tank
The clown in the video was definitely the less dominant one. The other clown would be very territorial towards him
