In Case Its Algae

[BrierS]

My recently purchased '87 300TD may have some algae showing in the clear, in-line filter. I suspect the car had sat for awhile prior to my purchase. Located what I think I am going to need to address this as well as being good items to keep on hand. I believe I need to order a few spin-on filters, a box of CLEAR in-line filters, a couple of o-rings for the tank stainer and possibly a new stainer. Of course I can't forget a case of Diesel Doctor tubes. I am uncertain if after receiving my order I should start with the tank strainer, clean and reinstall it, move to the in-line filter, then replace the spin-on filter. I have thought about using the Diesel Doctor, as read on previous posts, until the in-line really looks contaminated, saving the filters for after getting most of the algae moved. What are the steps from those having gone through this? Am I missing a step or two?
Steve