Mesh Tropical fish swims in circle !

It's a mesh fish, a linked invisible prim, and a rotate script located within the invisible prim. The fish goes in a slow circle around the invisible prim with no swimming motions, but the motion looks fine to me. By doing edit-linked, I made the fish smaller and tightened the radius of the swimming circle so it doesn't leave my small tank. Because it's mod, you can also edit the rotate script to make it swim faster or slower but it's a pretty good speed right out of the box.