Is liquid seeping from the fish normal when making gravlax? I'm currently trying to make gravlax for the first time! I bought about 2 lbs of fish, specifying that I wanted to eat it raw so they gave me something appropriate for that. I put lots of salt, a bit less sugar and some dill between 2 large pieces of fish, wrapped it up tightly in saran wrap, put it in the fridge with some weight on top.

This morning when I went to flip it, there was a lot of liquid in the bottom of the dish I put all of that in. It didn't smell fishy at all, I cleaned it up and flipped it and put it back in the fridge.

The lack of fishy smell makes me think everything is all right, but I wanted to ask if that's something to be expected, or if it's usual, or if it means the fish isn't safe to eat.

Thanks a lot!
Yes it is normal.

The salt (and sugar) will "extract" the water from the fish meat.

[...]On a technical level, what both the salt and sugar do is draw moisture out of the fish through osmosis. This decreases the moisture level of the fish, which in turn makes it less hospitable to microbial life. The salt, meanwhile, also helps ward off bacteria that would otherwise hasten spoilage. This extends the edible life of the salmon, but only for a short amount of time—gravlax is not cured in any long-term sense of the word. [...]

Taken from : http://www.seriouseats.com/2015/04/how-to-make-gravlax-cured-salmon.html