It's possible you had enough cured LR
to make for a really quick cycle. Just to be safe, I would add a pinch of flake and test in about 3-4 days for ammonia. If you have 0, you can slowly add fish. I would say 1 or 2 at first and then about 1-2 a month. This will allow the beneficial bacteria to build up and keep up with the additional bio load.
I also wanted to let you know SW
does not contain a lot of the beneficial bacteria. That resides in the LR
, substrate, sponges and filter media.
I would also suggest you get a refractometer and your own liquid water tests.