Algae problems, ways you get algae, and the various ways to fix them have been covered extensively. Look up threads that I have written and others in the Diesel Forum. Diesel Doctor (an algecide) is cure that is added to the fuel tank coupled with changing both fuel filters at least one time and usually more.
Turbo adjustments are also covered extensively in the Diesel Forum - use the search function to find them.
America: Land of the Free!
1977 300D: 300,000+ miles
American Honda: Factory Trained Technician & Honor Grad.
Technical Advisor to Am. Honda;
Supervisor of Maintenance largest tree care co. in US for offices in Tex.