My pearl gourami are the same way with coming to my hand in the tank... but they are always at the top... The Danios I used to have were pretty awesome... they would rub on your hand, freeze if they saw the net, and if they saw the end of the syphon, they'd swim away as fast as they could! Oh, but if there was food, they were the first there. The antics of ghost shrimp can be pretty funny... they usu. can't swim up, only forward and back, but they will swim and push into the tank wall, and use their front legs to "walk" up it, and see how far they get... sometimes they will have races... sometimes two will dance around, as though they are sparring, and at night, they will all go into the same cave, and two, always two, will stand guard at the door. They don't usu. eat algae, but the babies do... if one of them is pregnant (carrying eggs), they will all collect algae and I think they store it somewhere so the babies can eat it, because they don't come out of their cave until they are a bit bigger... I've also heard stories about a lake that ducks would land on, and one would get sucked under... they thought it was a gator, but when they looked, all they could find was a HUGE catfish.