Just make some water changes...make some 50% back to back. And with just plants, you don't need to add the dechlorinator until you do the finial refill. Just don't forget to add it.....
When you setup a soil based heavy planted tank-the soil and plants have all the beneficial bacteria for the nitrogen cycle-No need to add anything other than a dechlorinator that covers chlorine and chloramines if you are on city water-the plants will use any heavy metals. With plants-especially soil based planted tanks you do the silent cycle-it won't hurt to add a bit of extra fish food for the plants since that is one of the better plant foods for soil based systems anyway.
What is your pH and KH/GH....most of the plants that do well or recommended for NPT's like hard water.
Some plants are salt tolerant-but its still not recommend to add sodium chloride-you can add magnesium sulfate (Epsom salt) its also a good plant fert-But right now, I wouldn't add any chemicals other than the dechlorinator.