Chiller questions

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I am thinking about getting a chiller for a 30 gallon tank. I figure I probably won't get one because of the following two reasons, but I don't want to assume so I'll ask first.

I was concerned about noise, I assumed chillers would be noisy and I like silence.

I was also concerned about minimum flow rates, chillers I have looked at have been listed as for example "flow between 500 gph and 1000 gph". What if you want a lower flow? Will the line freeze up, or will the chiller just not work as efficiently?