Is sodium based fixer the way to go for archival photos?

I've read somewhere that one should not use rapid fixers if one wants archival quality photos (fibre based paper) Is that true, and can anyone recommend a good sodium fixer for that purpose?

I have always used rapid fixers before.

And, if I want to use selenium toner, can I use a fixer with a harderner, or must I use one without?

Thanks in advance!

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