Hello iplant,
Don’t give up yet, when you set your chiller to 25C it probably was the first time that the tank was cooled from its ambient temp which might have been 29 - 30? Which is a large temperature change.
Anyway if you had your lights on eg MH's will make the task harder, plus if your chiller is like mine, when you set it to a desired temp, it actually cools it down down to a temp 0.5 [approx] lower than desired then turns off. Unless you are keeping something special, set your temp at 26.5 and see how that goes.
Lastly make sure your chiller is getting sufficient air flow around it, so that it does not consume its expelled air.
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