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Black Moor Problem

Subject: Black Moor Problem
by guffman990 on 27/7/2020 0:29:58

Evening everybody
Around a week ago now i noticed that one of my black moors has developed white patches on the left side of its tail. I went to the local pet store and they advised me that it was White spot, i treated the water by following the instructions on the bottle.
Unfortunately the white patches are still visible. Im hoping somebody will be able to advise me as to what it is, or/and what to do next?
I have a 40 Litre tank, change the water regularly and i havent added anything new to the tank for about 6 months. The white patches are only visible on 1 of the 2 black moors in the tank, nothing else is in there.
Thanks in advance