My Poor Clown Fish

[Craigdillman]

First thought is ich/velvet or another parasite with that many new additions and the tangs and lots of clown fish there is probably incredible amount of stress in the tank , 90g is small to have 6 clowns in . And imo not qt any fish opens your self up to the risk of bringing in pests , the only other thing it could be (not sure how established your tank is or your set up) but double check your ammonia level . The low fish and breathing I have seen in my QT tanks when there is an ammonia spike it affects the fishy gills and the exchange of gas and chemicals and they can't deal with high ammonia but if that is good . I would error on the side of a parasite or ich and take the proper precautions and hospitalized as treat your fish