My demasoni looks like its holding. Not eating, looks like its chewing gum all day, and is starting to show a little bulge under its jaw. It is a mixed African tank. I don't know for sure which fish is male and which is female. I'm afraid to vent them cause I don't want to hurt them. I know egg spots aren't sure fire but its the what I am going by. My question is she is the only dem in the tank. Is there a chance another breed could knock her up (fertilize) her eggs?