i have been having a 50 gal in my room for half a year with no problem. recently i have noticed mosquito larvae and mozzies hanging around the tank. also there are lots of these tiny kinda triangular shaped flies sticking to the sides. the tank is in the room so its quite, if not VERY annoying. and its no because of the lights cos i only turn them on while feeding. any way of killing these insects? could it be because of the water?? anyone has any similar experiences???