Jen thanks for the response but i need a little more imput to make double sure. I have an 8" ornate that swims with an arched back. He never had this problem until i switched tanks on him. Three months ago i moved him into a 125 from a 40 and from that point on he developed the arched back. I'm not sure if it was a growth spurt that messed him up or a nutrition defficency or even just a deformation that took a little to actually happen. I really would like to hear what you guys have to say about that. Thanks guys/gals!