Hi all, should have come back here and said this earlier - ZarSasha, who had done some ports of other mods with fluid tanks, very graciously agreed to update this mod to 2.0 at my request. It is available here: https://mods.factorio.com/mod/zithorian-extra-storage-tanks-port
He has also added options to configure the size of each tank individually and done a balance pass on recipe costs, stack size, etc. Really a tremendous job, check it out!