Severum Issue Again

#1
My severums are getting black stuff on them the big one is in patches and the little one has black scrapes? Weird huh It happend before but went away does look life threating but i would like to get my little guy some relief. He was the ugliest fish in the LFS tank and he had 2 gimp fins i took him home to live out with my other severum. here is some pictures
[img=http://img252.imageshack.us/img252/5517/dscf4368gj7.th.jpg]
[img=http://img443.imageshack.us/img443/3281/dscf4367yw6.th.jpg]
[img=http://img516.imageshack.us/img516/103/dscf4363gs8.th.jpg]
 

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