FluidSystem allows you to build multi-block tanks of any shape with a maximum of 400 blocks.
The capacity of these tanks is very high, and they can store a lot, seriously a lot.
In addition there is a system of pipes that allow the immediate movement of large quantities of liquids.
To have the connected textures I recommend installing the ConnectedTexturesMod

Tanks

You can build any size tank, as long as there is a controller for each tank.
To insert the liquid inside the tank you must add the "Tank Block Input".
To transport liquids at extreme speeds you have to use pipes together with "output pipe" and "input pipe".
Remember to apply a redstone signal to enable liquid transport.
You can see some examples in the pictures.