How much is is leaking? Are we talking a steady stream? A drip every few seconds? A few drips a min?
The reason I ask, if it is a small leak it will eventually seal itself. I set up my 150 gal on the first floor with sumps in the basement. As it was going through the floor and in a corner it was hard to properly glue. Because of that I ended up with a very slow drip, about one ever 15 seconds. I wrapped some towels around it for a couple days and it sealed itself from minerals in the water. It no longer leaks at all.
That said, if it is dripping any quicker or you have soft water with low dissolved solids that may not work. If that is the case you will need to cut it out and reglue pieces.