You can buy a smaller pump, but you should get that pump, and just have enough overflow for it.. and the T with ball valve is adjustable, so you can adjust the water level in the tank with it also without putting extra strain on your pump.
You don't have to drill for durso pipes. It's just PVC hanging over the side of the tank. That is why they are inexpensive. The bottom of your tank is probably tempered glass and would shatter if you tried to drill it.
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