My brother had a gold veil angelfish named George (curious about everything) who I had to care for for about 5 months. He always came to the glass whenever I walked up like most cichlids do...but one morning I came down the stairs in the morning and the angels were posted by the old overflows where the newly born platy fry were fighting for survival like they had been the night before...waiting for a morning snack I assume. Anyway...and I swear this happened...when my shadow fell on the tank I was still only halfway down the stairs...but he spotted it and swam over to greet me wagging his tail!! I'm not making this up...he was wagging his tail fin and swimming up and down like a puppy saying good morning!
My angelfish are smart and follow me around the tank when I'm checking everything out...but George is the only one who really looked like he had missed me!