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Not quite sure what PLC Control is but interested,if you have a water feed at the location you could install a solenoid valve to deliver water once,twice or three times within a 24hr. Time table depending on the model you get.you could get one on line or Grainger's they will be pricey thou. As for water to get exchanged I would recommend a drain port with a screen on the inside (pervent escapes)several inches from the top of the tank.
As for temperature control you could get a use Poland springs cooler to keep the water chilled bit you will have to modify the evap coil to be able to chill the water and also have an adjustable thermostat.
One other important element is to keep the water clean from the ammonia build up,any and every pet store offer a product called Ammo chips pretty cheap and many different size containers to choose from.
I use a 55 gallon plastic drum that I burried in the ground next to my foundation and under my deck this will prevent sun and thermally protection from ambiant air. At a three day heat wave water temp will be nobgreater than 70° also for food I found they don't eat.
Posted from my iPhone/Mobile device
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