Recently I bought my sister some fish, 2 Black Neon Tetras, 2 Cardinal Tetras, and a Ghost Catfish. This afternoon my sister made a discovery. Close to the bottom of the tank is this weird spider web-like thing. She thinks they are fish eggs, but I'm not so sure. The fish ignore it most of the time and sometimes swim close to it. Can anyone be able to help shed some light on this mystery, please?