Somewhere I read about adding biocide to diesel fuel to kill microbes, or algae, or somesuch. Is this common, should it be done at regular intervals, etc.?

Wondering if I should do it "just because"...

BCingU, Jim

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'96 E300D 58k mi (wife's daily ride)
'95 Audi 90 118k mi
'92 GMC Suburban 138k mi
'85 300SD 230k mi (my daily ride)