Today I realised 3 fish missing from my tank.. I looked everywhere no sign thought they can't just go missing then in my head I thought check the intake on the filter quickly scrambled took the filter apart and found 3 platys and 3 fry inside the filter.. luckily all fine! And swimming in what space they had, but I also found a green fly??? Very random but is that a bad sign of anything I just don't understand how it would of even been in the filter