I know a hobbyist and have seen his system that uses a siphon setup. It’s in his living room and has never flooded in the 5-6yrs running. Me on the other hand got the green light for my first internal overflow tank 17yrs ago because my tank flooded the apartment 2-3 times.Lots of really useful comments above.
My aquarium isn't drilled and I'm nervous of using a siphon overflow system in case it fails and floods the house.
Are siphon systems reliable, or should I get a drilled tank?