Maracyn - plants, shrimp and fish safe?

I just bought 7 harlequin rasboras and 6 neons for my 20 gallon tank.

The tank also has some ghost shrimp, otocynclus cats and two cory cats.

Two of the rasboras have a lone white spot on their lower jaw and this started about a week ago. The spots don't appear to be spreading but look like a fungus and not ick

I bought maracy and treated the tank yesterday and noticed that two of the ghost shrimp died.

Probably should have asked this earlier, but is maracyn safe for shrimp, cats, shrimp or even clams and crayfish (Have some of them in there too)

Thanks.