I couldn't load the pics. But doing one treatment at a time with 100% water changes in between is the right thing to do. Being without a filter is fine if you do 100% water changes twice a week. If you find the "cure" the fins should stop eroding. Aquarium salt is fine as long as you keep the concentration the same. Especially don't lower it suddenly. If you decide to stop using it, taper off gradually.
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