one of my prized fish that i've had for a few years now is the white-cap clownfish. They are very very hard to find (and if you found one let me know where!) and I've been searching for a mate for him/her for a long time now. There was a time where I actually had 5 of them but b/c my tank was not set up at that time (they were being temporarily housed). When my tank was ready, there was only 1 left (the rest were sold or given to my friend who was helping me hold them - long story short).
It's a really really shy fish. It's housed in it's own 29 gallon tank that is plumbed to my 110 gallon tank. I gave it a rose anemone for it to host in and it rarely leaves it. If it does, it darts out to grab food and immediately back inside. Here's a video of it.