That looks great! Just be sure he has the same temperature as in his usual home. While you are getting the AQ salt, be sure to change the water daily, same for when he is on AQ salt treatment. Do not treat for more than 10 days. Maximum of 3 tsp per gallon if you need to increase dosage if his condition worsens.
You are very welcome
Hope his fin rot will go away quickly. I may not be able to come on this board as I will be away on vacation. If you have any question, let us know or start a new thread. Best of luck!