Definitely! Once your tank is done cycling, meaning you can drop 2ppm of ammo to 0ppm in 24 hours, you will still have high NITRATES. You will want to do a big 40-60% pwc
to knock those down to <10ppm or as close to 0 as possible. Then you can put in a hardy fish like a clown, and continue to test to see how your tank is handling the bio-load. If it does okay, wait 3-4 weeks, and try and add another fish.