That's an interesting piece of advice.
It should be noted that pumps designed to run in aquariums, usually encounter a relatively low flow resistance.
In a PC cooling loop, the flow restriction is a fiar bit higher, and that causes the pump to draw more power and, in turn, heat up some more.
So monitoring the pump temperature would be a good idea, when using a pump that's never been used before, or in an unusually restrictive loop.
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