I have a pair of Dragon Faced for 3+ Years, pair of Janns for 18 months, Australian Blue Line for about 14 months.
I have been keeping Dragon faced for the past 10 years. With a good pod population they thrive. Whenever I try to add more than 2 the additional ones vanish.
My dragon faced are out and hunting all the time. My Janns I kept a glimpse of about once every 6 months if I happen to be up at 3 am when the lights are in the last phase of dimming.
However, in the past 2 weeks I have been doing some work in the tank and with my arm in the tank up to my armpit twice the Janns have cruised across the tank to brush past my arm.
The Australian Blue line is also something that i seldom see. Every 6 months or so I will catch it cruising underneath a piece of shelf rock and then it vanishes again.
If you want to see them you want the dragon faced.
Dave B