I ran a different brand of 1/4 chiller on my freshwater 125g
I set the differential to 3 degrees
If it was set to 2 degrees, it would short-cycle;
Chiller would only run for about 45 seconds, and would run every 4 mins
With it set to 3 degrees, it would run for about 4 mins and roughly about 4 times/hour
The tank temp was 78F and I never saw it fluctuate, even with the 3 degree differential
My current chiller is a 1/10 on my 75g, with a total of 110g of water
My RKL runs the chiller with a differential of only 0.4 degrees and everything is fine
RKL turns on the chiller, takes a few minutes to power-cycle and sense what is going on, turns on and runs 'till RKL shuts it off
I have the chiller set to 77 (with a 2 degree differential) and run my tank @ 79, so the chiller will always turn on when powered up
Maybe this will fry the chiller processor, but it's worked fine for a year so far
HTH
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