I have an AquaController Jr that controlls all my lights -- HQI, T5 actinics, moonlights, sump light, HEATER, chiller, et al.
There are many many types of Auto Top Off devices. Check out MD or Premium or Drs F&S, plus there are websiets like autotopoff.com that will do the job. I use the JBJ ATO and it works just fine. I have it connected to my Kalk Reactor. It has two sensors, just in case.
You can also get a heater with a controller for less money than a ful fledged controller.
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Fishie (MASLAC member)
"It's alaways a sometin'" -- Roseanna Roseannadana
Current Tank Info: 225 gal LeeMar Reef; Deltec AP 702, ProFiLux, 90 gal sump/fuge, 3x250 HQI Lumenarcs. 4x96W PC actinics; 375 lbs LR; 3" LS; Hammerhead CL, Korallin c3002, KM500, Auto Water Change/Top Off; Aquatinics 1/3 HP drop in
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