I have my bubble line just barely inside my cone. It can take several hours for it to start producing good bubbles and skimmate into the cup after you set it. Be careful not to set it much higher ( or have time to watch it after). If I set mine too high it will overflow very quickly, even if at first it does not look like it. I got mine used and for the price it was a good skimmer - Produces a lot of good skimmate, bit as stated before have had problems with it overflowing. Just be able to watch it closely.
75 Gallon Saltwater Reef
Just your average LVT (licenced vet tech) trying to help the world's animals!!