This Piranha is very interactive and swims up to greet you, but she is not trying to kill you through the glass, too smart for that. She is taking down about 30 rosies a day. We usually put the feeders in every other or every third day. They are normally hunted and completely whipped out the same day they go in. She swallows them all whole so its just fun to watch her hunt the fish all day. She has a huge jaw and seeing her yawn is really somthing to witness, i wish i could get an action pic of that.