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Did openblocks make it to 1.12 yet? I know they have at least 1.10 and 1.11 and they have clear multiblock fluid tanks if that's what you're looking for.
Immersive Engineering has Multi-block tanks, as well as Wooden and Metal barrels that will connect vertically automatically if you set them on top of each other. (Metal for hot fluids, wooden for colder ones.)