i baught a cory cat about a little less than a month ago and he just swims back and forth up against the front and sides of tank going crazy fast and wont stop. all the other cory cats ive ever had just relax on the bottom and act nothing like this one and i kno it nothing to do with my water or anything cuz all my other fish are perfectly fine and i tested the water...could i have just gotten a crazy 1 or what?