Hi i posted the other week , we lost our black moor due to a ? fungus infection we tried to treat. Other fish showing no signs but for the last week has been looking very sorry for itself just staying in the top corner of tank not swimming around at all and looking gen unwell. We had the water tested which came back fine but his fin on his back is down and gills on his sides quite open, his mouth is opening and closing all the time. Hes not gasping for breath above the waterline but i get the general impression that he's struggling. we are still doing the partial water change each week but im not sure what to do. Feel like we are just waiting for the inevitable