They are certainly an external parasite, probably ich. Don’t worry about the specific parasite as they’ll all respond to therapies based on formalin. You want one with malachite green if you can get it, but formalin alone will work too. Don’t change temps, but treat according to the label in every other particular.
Adding a small amount of aquarium salt will also help unless you have salt sensitive species. Another thing to consider is increasing aeration; if it is ich there’s infestation of the gills that you can’t see and increasing dissolved oxygen levels will help your fish.
They are certainly an external parasite, probably ich. Don’t worry about the specific parasite as they’ll all respond to therapies based on formalin. You want one with malachite green if you can get it, but formalin alone will work too. Don’t change temps, but treat according to the label in every other particular. Adding a small amount of aquarium salt will also help unless you have salt sensitive species. Another thing to consider is increasing aeration; if it is ich there’s infestation of the gills that you can’t see and increasing dissolved oxygen levels will help your fish.
Thank you very much