I have the RKL on my 75 gallon tank.
my modules are:
SL2 (to monitor pH levels, and float valves to set off alarms for water levels in my sump)
PC4 (controls 4 outlets; 1x for my heater (turns on/off via temp probe measurement), 1x for fuge light, 1x for my koralias, 1x for my auto top off (controlled by float valves))
i also have 2x ALCs. which control the dimming of my 3 channels of LED lights for a sunrise, noon, sunset effect. Also a 28 day lunar cycle at night
Nino, have you tried posting on their official forum? they seem pretty helpful there.