Wow I almost freaked out this morning. My Silver Arowana, which is housed with a Jardini, had his mouth wide open with some red looking meat hanging out of it, similar to how an eyelid looks when it's flipped. I immediately accused the Jardini of damn near killing it and was about to set up my hospital tank. I left for about 5 minutes and came back, and the Silver was back to normal! I would've taken a picture if I could have but I didn't know it wasn't really damage. Has anyone seen this before? Any idea what it was? When I originally saw it, he was swimming with his mouth wide open as if he was yawning and his jaw got stuck.