Prime does act as a "24 hour band-aid" binding to nitrogenous pollutants rendering them non toxic. Prime, like other water conditioners/ammonia binders, tends to biologically degrade after this time period and may need to be re-dosed to keep these pollutants bound until such time that your biological filter consumes them (keep in mind that even though ammonia and nitrite may be bound by Prime, your biological filter can still consume them). Also, the chloride in your aquarium introduced in the salt you used will negate the affect of nitrite poisoning to a degree. To encourage rapid development of your biological filter, I recommend dosing Stability on a daily basis and increasing water flow in the aquarium if possible via a power head or air stone. This will create oxygen rich conditions as your biological filter is dependent on oxygen. I would also suggest using Prime on a daily basis at an elevated dose per the instructions to keep the nitrite bound in a harmless state until your biological filter matures as mentioned above. Performing partial water exchanges is another option to dilute the amount of nitrite in your aquarium. You may also want to cut down on feeding until your biological filter matures as this will also limit the amount of waste produced in the aquarium.