I am going to use a 100x40x30 fish tank and have another exactly the same for overflow if I need to expand the setup
I am going to use water in the bottom of the tank heated by fish tank heater.as its a tried and tested way so should keep everything right hopefully.
And am going to be using 23x17x14 tubs connected with 2 and half cm clear tubing
Heres the tank and some tubs and bits I have to start with




