One of my neon tetra is swimming in a corkscrew pattern. Twisting around, and occasionally laying on his side on the bottom breathing heavily. His color is the same as the rest (not pale ot discolored). The other tetras look fine. The Ph is 7.2 Amonia Nitrite and Nitrate are all 0 Temp is about 76 f. ANy thoughts. I have 8 other Neon Tetras and two ghost shrimp in a 10 gallon tank.