My 6 year old daughter noticed a red "bag?" on the underside of her Molly. It is in a 15 gal tank with some guppies, snails, and 3 small algae eating shrimp. I cant test the PH at this very moment as I have ran out of strips and need to run to the store to buy some. Can you tell by these pictures what this may be???? She is REALLY worried about it...