You didn't notice this around feeding time did ya? One of my Red Caps swallowed a whole Algae Wafer and was doing that for a couple of hours once.I couldn't see the wafer in his throat,but I was right there when it happened and man did it scare me. Apparently after it dissolved,hi mouth was closed again.

I guess it was uncomfortable for him having it wedged in and maybe that's the only way he could be until iot was done. I hate when these abnormal things happen...You just don't have a clue.