Today, as I was watching all of my fish, something caught my eye. One of the pandas had gone to the top for his usual gulp of air. But as he came back down, he went into this sort of spiraling, upsidedown, right side up, out of control motion. Almost like he had lost his equillibrium, if they have that. I thought I had seen him do it the other day, but I missed most of it. Tonight there was no doubt, my wife saw it also. Water params are all good. Anyone else ever see this? Any ideas?