they can be jumpers, so get a lid! Mine also likes to race along the long side of my 55g :D they're really inquisitive and he won't shy away from my hand when I'm in there doing stuff. They enjoy hanging out on the bottom and chilling out on the surface (mine will float around like a boat, then go explore the bottom for a while). They rarely hide and like to "walk" about the bottom with those big fins. They can survive out of water for a short period of time, as they have a primitive lung type thing. I'll attach a piccie of mine too, he's awesome! Very entertaining, always hungry, and absolutely BOMBPROOF. Mine went through a heater malfunction, an ich outbreak (not a spot on him), and a brief stint in a bucket (only like 2 days, but still).