Ok, in the midst of the build now, but will post a thread outlining what steps I did to build and progress. And some pics of course.
As of right now, raspberry pi zero w is controlling 8 power outlets, and I have 3 temp sensors, 2 of them in tank controlling 2 heaters, one monitoring ambiemt air temp. As I said, its modular...and my next part of the build will be PWM control of 2 beamswork DA Fspec 48 inch. The pwm control reef pi offers is similar to a tc420 but you can have 16 or more channels of control.