For instance, Abyss ( RIP D: ), used to watch me draw or watch television.
Knight watched me draw and covers half his tank in a giant bubble nest, and when he decides he's not comfy enough in his plants or rock, he'll curl up in a corner with his face in the rocks.
Knight is also a little weirdo because he loves it when I put small figurines (like the Ho-oh figure that came with Pokemon HeartGold) up the side of the tank and wiggle it around. He shows off, does a mating or aggressive dance, and blows more bubbles.
Apollo is curious as a cat and will spend an odd amount of time investigating anything and everything.
Also, share pics of your weird fish!