Fancy Fluid Storage is the fluid storage solution you've been looking for!
This description is undergoing a major change due to v2.0.
There is no ETA on when it will be done.
Modpack policy: One can use the mod in their modpacks, as long as they are crediting us properly for it.
As well, monetization is not allowed.
Size limitations: Up to 2197 air blocks inside the tank.
If you find any bugs or got any suggestions, feel free to make issues on the GitHub for either of them.
Enjoy playing with the mod! :)
FridgeBoy, for helping with a lot of mathemagical things
Drullkus, for the amazing valve-texture and logo
tterrag, for helping out with fake block-rendering for the tank frames (up until v2.0)
Gigabit101, for maintaining and updating the mod to 1.12 when I needed a longer break from it