I lost a kissing gourami this morning and none of the other three will eat. I am going to put these three, if they last, in a quarantine tank on thursday and just do a complete restart. Can reused plans and decorations hold any types of illnesses?
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It did sound a pretty bad outbreak unfortunately.
Drying out / treating as mentioned above means you can re-use. If there is any water with the decorations, etc it is possible ich could transfer with that so you have to give it 10 days still to make sure all gone.
You will always have bacteria and fungus in the water, it's just that usually the fish have their slime coat, scales, etc to protect them. So also having separate gravel vacs, etc between main tank and QT can be useful just in case.