Please meet Kate Bush, who I adopted after she was brought to my office in a tupperware sandwich box years ago, by a colleague who was moving to Spain. Amazingly she survived and is now a hefty great thing!
She used to be almost entirely black, but after hanging out with goldfish (and eating their food) seems to have adopted their colours.
I have never identified her. Is she a veiltail? That description would certainly suit her! She was named Kate Bush because of her 'flowing robes'!
http://farm1.static.flickr.com/161/3496772...055bc9dbc_o.jpg
http://farm1.static.flickr.com/130/3496772...cb1067433_o.jpg
Incidentally, when she swims, the tail flares out most spectacularly, but I did not manage to capture that in a photo.