First, you do not need to add all those conditioners to your tank! They all do the same thing, so just pick one. Prime is an excellent product, but you absolutely do not need to add it to the mix, your water is more than adequately conditioned.
A little too much won't usually hurt, but I would be wary of using way too much. Are you trying to by-pass cycling your tank? No amount of water conditioner in the world is a substitute for cycling your tank.
Salt is not essential, unless you are keeping fish that prefer brackish water (such as Mollies). If you do not know what you are doing, you can do more harm than good by adding it. If your fish need it, buy regular aquarium salt from the fish store (never use salt made for human consumption, it's different), and follow the directions carefully.
Some people claim it keeps your freshwater fish healthier, I have never seen anything to substantiate that claim. Based on your questions and information given, I will offer you the most useful bit of advice you will get: Skip the fish store, you have more than enough water conditioner. Instead, stop at a good book store or public library and get some beginner's aquarium keeping books.
These things are written for the novice, and are chock full of answers to questions that you don't even know to ask. They are truly worth their weight in gold to people new to the hobby. I still refer to my volumes from time to time, and I have had several of them for years and years.
Good luck!
I remember when I discovered "Prime". Great and I have been using it ever since. There is a difference....Any way.
I don't add salt to my tanks because mainly of plants and Cory Cats. I also see no need for it since "Prime" adds to the slime coat.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.