Ok, slow down and type clearly. Explain exactly what is going on and which line.
1. Are all your overflow pipes seated and locked?
2. Did you leak check the overflow pipes before connecting the lower pipes?
3. What ever line is leaking take it apart and inspect the O-Rings.
4. If all O-Rings are good reassemble.
5. Do not use any thread tape on stock Red Sea plumbing.
We have taken all the piping apart. This tank has been set up since May, 2015. I tried to contact Red Sea to no avail. We don't see any problem with o rings, but don't have extra on hand to replace with. We re-attached and pipe is still leaking where it attaches to the tank with a bushing.