hi I'm new to this forum, I need help, a couple of weeks ago one of my fancy fish had a paracite I took it off and went to pets at home and asked what I need to use for paracites they gave me some aquarium salt and now all my fish are covered in them its really bad I'm literally scraping 5 at a time off. what can I use to put in the aqaurium to stop all these horrid things?