2-stroke is a great additive for lubricity and is widely used in other diesel communities. 2-stroke synthetic is designed specifically to burn in a combustion engine to bring lubricity without leaving any of the byproducts in the engine, but I get that some diesels can be finicky.
I also understand that my M-B 3.0 was built with ultra-low sulfur (the process for removing sulfur also removes the lubricity from the fuel) in mind but all fuel is not created equal. Anyways, I don't think I have seen a product that is strictly an algacide, it usually comes as part of a total package for lubricity, cetane, water-separator, etc. I just thought there would be a preferred product for this particular diesel.
All manufacturers say no additives - Chevy, Ford, Dodge, pick one, but the reality is fuel quality ain't great across the board and some extra help in the "slickery" dept. is something to think about.
I'll do a little more reading on the subject but it seems as though the M-B community shies away from additives - tough to argue with experience. I feel that away about oil additives, I won't use them.
2018 (2016 M-B 3500 Chassis 3.0) Winnebago ERA 70A