Nudibranch - Chromodoris Reticulata (I think!)

This shot was taken while diving on the Rockingham (WA) Wreck Trail last week. My first dive on this site and I don't know why I haven't done it sooner. The site has two small aeroplanes and two small boats together with a reef of old tyres and a 'Chook Pen', (Chicken House), all sunk close to the beach and connected by ropes to make navigating the site easy. I was lucky to get 5 - 10 metres visibility, it's normally less due to the silty bottom. The maximum depth is 18 metres.
This Nudibranch is one of the larger ones I come across, about 3 inches, and its colour and markings were excellent.