There is another problem with leaving the pump on all the time while shuting down your PC....
Heat
My ViaAqua 1300 required 20watts to run, most of which is heat. I left my running today for 1/2 hour and water temp reached 32C.
As for pumps in wave setups, I doubt (in my opinion) that turning in on once or twice per day will seriously affect the life span. Heat probably would.
Again, no proof, just my reasoning and opinion.
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