Nice to be graced with their presence once in a while, I've had a pair for many years and will get a glimpse of them about once or twice a year. The only reason I know they're still alive is that the number of feeder goldfish kept in the tank diminishes every week or so. I wouldn't do the live feeder thing except that they are too shy to compete with the other more aggressive cats in the tank that beat them to non-live foods. Since they're so reclusive I question why I bother keeping them at times.
Yours are looking very nice and healthy, lovely to look at when they show themselves!