I would never recommend treatment in a display tank unless we are talking about ich. Too many things can go wrong and simply make things worse.
Any treatment, either medication or aquarium salt is stressful for fish and inverts, so why treat otherwise healthy fish along with your sick fish? Many fish and inverts arent tolerant of medication, especially the effective ones. Any medication that is genuinely antibiotic wont discriminate between the bacteria you are trying kill off and the beneficial bacteria responsible for your cycle.
If you want to risk it though its up to you. Look for a broad spectrum medication. Different countries have access to different medication. Here in the UK we dont have access to antibiotic pet medication, so i cant make a recommendation on "the good stuff" from first hand experience.
Aquarium salt is an option. Most inverts are OK with the low levels of salt you use when medicating, but again its a risk. Salt is harmful to
FW creatures, its just more harmful to bacteria than fish and inverts.
Melafix, pimafix or something like Esha2000 are general medications that are generally safe to use in a display tank as they arent really antibiotic. But they also arent all that effective.
If i couldnt isolate and treat a fish, up the water changes to 50% per day. Clean water will assist fish with their recovery. I might try something like Esha2000. It would be more in hope than expectation though, I wouldnt expect any recovery though and the treatment could be to the detriment of the other inhabitants. Some aquarium salt should be ok, but again its at your risk.
Personally i wouldnt want those fish potentially infecting other fish. If i couldnt isolate and had no real hope of treatment i would euthanise.
Its up to you though. I cant tell you how risk averse to be. The best thing to do would be get to the store and put some kind of QT together.
Longer term you need that nitrate down. Up the water changes, reduce numbers of fish.
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