If the fish are now acting normal, no flashing, or at least rare occasional flashing, then I would say just observe. I would also get the KH test kit. If the KH is low, the pH will swing quite dramatically from very low in early morning to quite high in late afternoon, and that is stressful. Do not add more salt as it limits the choices of parasite treatments. Typically we recommend water changes of at least 10% per week. Keep us informed.
Zone 7 A/B
Keep your words sweet. You never know when you may have to eat them.
Richard