So you still have ammonia somewhere between 0.25-0.5ppm. Ammonia is more toxic at higher pH, meaning the same ammonia reading at pH 7 or less is more toxic to fish when the pH is >7. Your pH looks to be around 8, so the ammonia present is more toxic in these water conditions.
Your nitrite looks to be around 0.25, the lowest readable level. It is still stressful to fish even at this low level, but the addition of salt so the system will enable the fish to avert nitrite poisoning. 1tbsp/5gal. I will attach a pic here soon off my cell phone of the salt I buy from home depot for $8/40#, a necessary quantity for large volume tanks like ours.
Your nitrate looks to be 5-10 which is a very acceptable level, and what I target my return too on water change day. Once the ammonia & nitrite present are converted I would expect your nitrate to be somewhere in the 40-80 range.
The good news about the presence of nitrite means that the nitrobactors that convert ammonia to nitrite are present in your filter. And the presence of nitrate means the nitrosomas that convert harmful nitrite to less harmful nitrate are also present.
This is great news because it means your beneficial bacterial colony is present & on their way to a full cycle once more.