i was feeding my 2 ornates and sen market prawns i feed with the light off so my bigger ornate feels a little more comfortable coming out of hiding and i have these cheapo pair of night vision goggles that i use sometimes to watch them eat and make sure he is getting food. well i was looking around for my sen and i looked and couldnt find him and saw my ornate had something but i couldnt see from that side so i went around and saw my 5'' sen stuck in my 10-11'' ornates mouth tail first just past the whole tail. i turned on the lights and scared him and he let go and i put the sen back in the little tank in my room and he had a little bit of scraping but nothing major and he could still swim just fine and today hes doing great. i think it was an accident though since ive havent had problems before and i was during feeding. if i wouldnt have seen it i think the sen would have died eventually and possibly my ornate because he was trying to swallow him backwards and his spines would stick up in his throat. i dunno. my mistake. plus the sen is back with my other sen and knight gobies and seems to be more comfortable in the smaller tank.