Vicki if you suspect Costia and I seem to agree....I have a treatment that has worked well for me and is less toxic than copper Chlorides. My king pk started to get cloudy eyes then a white clump under his mouth. The raising of temperature and total black is a good remedy but it takes too long. The product I recommend is called Cupramine by Seachem. Less toxic, superior to and safer than copper chlorides, sulfates, citrates and chelates. You only need a very small amount. I treated my fish and within 4 days he was clear and no side effects. I'm sorry to read of your disaster.....hoping things will work out for you soon.