OK, so I've done a little research and apparently one hotumatua was sold in 2010 at aquarise in Japan. Whether this fish was recently collected at the time or from another hobbyist, I do not know but it here goes.
<a href="http://www.flickr.com/photos/54478441@N03/6110078823/" title="hotumatua 1 by Aqua-Boutique, on Flickr"><img src="http://farm7.static.flickr.com/6194/6110078823_826c034798.jpg" width="500" height="500" alt="hotumatua 1"></a>
<a href="http://www.flickr.com/photos/54478441@N03/6110079207/" title="hotumatua 2 by Aqua-Boutique, on Flickr"><img src="http://farm7.static.flickr.com/6067/6110079207_07eab30ba2.jpg" width="500" height="500" alt="hotumatua 2"></a>
And I also found this recent post in a japanese blog with one
<a href="http://www.flickr.com/photos/54478441@N03/6110624688/" title="hotumatua jap by Aqua-Boutique, on Flickr"><img src="http://farm7.static.flickr.com/6200/6110624688_3c09d34e52.jpg" width="500" height="375" alt="hotumatua jap"></a>
This last fish is in the same tank as the C. nigriocella and the two fish sent to Japan by Aquatouch, Golden Basslet (Liopropoma aberrans) and Bladefin Basslet (Jeboehlkia gladifer).
One can always dream, right?
I should start learning Japanese...