The overflow should be able to handle more flow than the pump can deliver, but should not be excessivly larger. If the pump can out do the overflow, you need to gate down the flow from the pump to prevent overflilling the tank. I'm not sure how much flow you want, but something in the order of 300- 400 gph would probably be good for your 33. Keep in mind that a pump rated for 300 gph will flow less than that once you add in the head loss in the plumbing. Figure out you plumbing layout, then determine the loss. That will give you an idea of what pump will work. ReefCentral has some good calculators on their site, and I'm sure there are others too.
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I retired and got a fixed income but it's broke.
Ed
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50 gallon FOWLR, 10 gallon sump.
130 gallon reef, 20 gallon sump, 10 gallon refugium.
10 gallon quarantine.
60 gallon winter tank for pond fish.
300 gallon pond with waterfall.
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