When I got home this morning, my molly was dead at the top of the tank with a 1 cm hole in its gut. Earlier in the month I noticed its lips were enlarging and it was getting fat, however, the hole in its stomach was made in one night! I recently started feeding bloodworms as well as putting an archerfish in there. The archer fish is not nipping though. My black molly now is very fat (until now I thought it was pregnant) and its lips are turning white. PLEASE HELP!