I have a 5 year old budgie who has his cage open all day so he can come out whenever he wants. Today he has just discovered my freshwater tank and he keeps flying over and sitting on the side. Now you're probably thinking just get a lid but it's not as simple as that as I have a light canopy plus the shape of the tank isn't like the average shape tanks, it's curved. So getting a lid isn't a option. We're worried that the water might do him some harm if he drinks it or he might do harm to the water if he poops in it. Anyone got any ideas on how to stop him other than locking him in his cage all day?? Maybe put something along the edge of the tank to stop him standing there?? Any ideas??