Goldfish marked following fish louse episode?

Question

Our cold water fish tank containing a goldfish and several fantails recently was infected with argulus lice. We treated the fish with salt baths and pottasium permanganate. We also put them in a fresh tank during treatment and treated their old tank. I think that the treatment has been sucsessful as it has been 2 weeks since we put then back in their old tank and there has been no flicking or rubbing. Two of the fish however have marks which were present when the infection was ongoing but have not cleared up particularly. The goldfish has a dark mark on one gill about 5 mm diameter which has got darker in the last week it also has a little dark streaking in the tail although a tear that developed during the infection has healed up very well. The fantail had a darker patch near it`s dorsal fin which now has a couple of small marks similar to those on the goldfish but smaller. All the marks look like scabs healing but I`m not sure. Could it be stress as the filter recovers?

Ally s: That`s encouraging really as it`s what you might expect given the fresh start and all.

Answer 1

The black marking could be the result of the ammonia/nitrite as the filter recovers, or from the salt/permaganate if it was a little too strong. You might also see these form around the Argulus attachment sites.

The black marks are similar to a bruise, or as you say, a scab - they show where damage has occurred, but that the area is healing.

See "black patches" in this link: http://www.fish-disease.net/diseases.htm

Answer 2

have faith it or no longer it is going to artwork I knew a kinfolk that used it returned until eventually now walmart stayed open all night on maximum shampoos it says will kill lice they used it to start up the therapy and it did kill the lice of path they went to the save while it opened to end the therapy

Answer 3

The black bits sound like ammonia poisoning/burning