so my 11" ornate bichir has been acting normal and eating masavore pellets as it usually does. but yesterday i saw he had kind of a weird bulge in its stomach, maybe 2" from the head, now today he just puked up alot of food... could he have swallowed gravel? and is causing a blockage? whats do you think is going on? he is acting pretty normal now, but i really like this fish and don't wanna lose it.