Ebb & Flow

Hi everyone, i'm setting out my new grow room with a Ebb&Flow table 2x1 m under 2x 600w HPS. i have also an automated ph corrector and EC controller. i wanted to use rockwool slabs and 15*15 cubes, for watching what difference.
know i have some question beacause it's my first time in hydro
- how big need to be the reservoir? i have one of 90L and one of 150L
- i need to control water temperatur?
- how often and how much time i need to watering the system?
- what do you think if i fill all the space betwen cubes and slabs with hydroton or something else?
- what about growing autos with this system?

Saludos
 
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