I think most of the people using chillers would prefer to use a chiller that is over rated for their tank size (e.g 1200 L capacity for a 400 L tank). This ensure that the compressor is not subjected to excessive wear and tear due to frequent or constant usage. A larger chiller can also cool a tank much faster and efficiently. Also, since the chiller is turned on less often there is less heat and noise produced. 25 to 27 degrees would be the common temperature setting on the chiller for a planted aquaria.
At the least, a chiller should be of equal capacity of your tank, definitely not under rated/powered.
Cheers,
I have dwarf cichlids in my tanks! Do you?
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