Thanks guys that makes me feel a little better. The reason is that I had a redtail a long time ago who did the same thing and ended up dying on me. I hope this doesn't happen again or I am going to take out alll the gravel from my tanks!
I just hope they don't come out the back end- ouch! That's what you call a "ring stinger" I suppose theirs nothing I can do except wait and see if he passes them.