I wish it weren't true that so many new fishkeepers are lulled into thinking that if they add a whole lot of stuff to their new tanks that it makes it better for the fish. Unfortunately that's just not true. I found that the best things for nearly all fish are a nice, clean tank with fresh, dechlorinated and warm water and a good, high quality food meted carefully.
Unless you're keeping a marine aquarium or are trying to treat ich without chemicals, lay off the salt. You've got freshwater fish! And I saw you mentioned using some of your older filter media for your new tank which is good.
Best medicine for fishies is clean water and lots of it. You should be doing daily water changes until your filter is cycled. From your stats it appears that it might be cycled, but you should still be doing at least weekly water changes of 50%. Clean the filter housing and intake tube once a month. If you have gravel, use the gravel vac with every water change and really plunge it down into the gravel.
Really sorry about your loss, but your next fish will have a much happier home.