I got mines from NY Aquatics.. I've seen that rare one with the red and white pattern twice there... It was in a tank next to my reef also connected in the dark I think that's why it turned almost black..
On a similar note I can't wait to find a small nano cheap to set up another Angler tank. They are great fish with great personality.
Speaking of which what is the minimum sized tank for these guys? Even at full grown?
Depends on the species. There is a Deli (yes a deli) in NJ that has an angler in a tank that would barely fit inside a 24 gallon aquapod because it is so big. They have had the fish for years. It looks like a huge rock. Pretty cool fish.