I use the RK2 and it's pretty decent. There are some more advanced but expensive controllers out there too though. The GHL Profilux controller has aph probe, salinity probe, temp probe and an orp probe. You can also purchase a dosing module 1 - 4 pumps (great for 2 part). It also has an led bar that is dimmable! YOu can prgram it to make it a cloudy day, sunny day etc.. It has a built in web server and like a million other things. What's the catch it can cost about $1,000.00 if you really get into it and order a bunch of add ons, but it kicks ***!
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My tank is like whiskey it gets better with age!
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