So I am thinking about one too, but how much of what I have will benefit from adding controller?
Heater - important (currently controlled by ehiem jager only)
Radion and
MP10W which are controlled by computer on radion
Tunze Osmo ATO - usuing with kalk
BRS two stage c/gfo reactor
HOB skimmer
2part Ca/Alk peristaltic pumps controlled by timers -
Battery back up
I am missing something, not sure I need one.
I can think of the following that might be handy for you (I'm thinking APEX);
Shut off the kalk if the PH passes a set point
Shut off lights of temp goes too high
Be able to monitor that everything is running, PH and temp are good, remotely via the net
Track electricity usage by device
Keeps graphs tracking PH, temp, electricty, (and second PH, ORP exct..)
Automate the dosing pumps to do 24 tiny doses insted of one larger one
Turn on and off cooling fans depending on temp
Sends you text messages and or e-mail if the power goes out or something else goes wrong
Effectively allows you to have as many temp and or PH controlled devices that you might ever want in the future.
$500 less money in your pocket to start, this is handy if you have too much money and consider that a problem