How many feet head of pressure will there be on the pump you are wanting? In other words, how many feet up is it from the pump to the waters surface of the in the 29 gallon? Once that is determined, it will be easier to figure out what size pump your going to need. A 29 gallon only needs 120 to 175 GPH turn over rate through the filter.
For example; if the sump sits on the floor and the top frame on the 29 gallon is 4' off the ground, you would want a pump that flows approx 120 to 175 gallons of water @ 4' of head.
There are plenty of power heads that can flow approx 350 GPH But they typically have tiny impellers not designed for any back pressure (head) on them and their flow rate drastically drops. Now, take a return pump that claims it flows 350 GPH that is designed for back pressure (head) and will flow significantly more water than the power head although they are both rated @ 350 GPH.
To know what pump you need, you need to know what the head pressure is and then choose a pump that flows the desired amount of water at that head height.
Another concern I have is how are you going to drain water from the 29 to the sump? I don't think that the approx 150 GPH water flow has enough velocity to prevent bubbles from accumulating in the "U" tube of a overflow box and likely will cause an overflow. Drilling the tank may be a safer, more reliable option. (I can drill it for you if needed)
Joel
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