hi. i am relatively new to keeping fish and am having a problem. i have 4 neon tetras, 2 zebra tetras, 1 molly ( who has her tail fin bitten) 4 guppies ( one of which is also missing some of its tail)and two algae eaters ( dont know what kind, pet shop sold tham to me when i asked for tank cleaners.) Up until today i also had a red honey gourami. I was blaming him for the fin nipping, however when i found him tonight he had had his tail completely bitten off and was unable to swim. So obviously its not him. has anyone any ideas which of the other fish could be causing this????