Mate I live in the Sub tropics were in the summer its usually a verry Humid/sticky 35c.
I water Mine ever arvo without fail..

That Link.
its More for the Out door begginer than an established indoor grower.

the Moons Phases still work when growing hydro but its not as important as outdoors..

I have been growing for over 10yrs and have used this system for the Last 9 of em..
I can Guarentee if you grow by Just This chart and Use water alone in good soil you will have a Nice Harvest..