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I have a single 750 koralia in my tank now but feel that I need flow from the other side of the the tank to keep things moving. Should I put in a 425 or 250 koralia?
Well, obviously you will know best as it is your tank. I just know Carey uses (2) 750's in her 29. I was using (3) 750's in my 54 and upgraded to (2) MP10's. In total I have about 3500 gph in my tank and the fish and corals seem to love it!
Out of your (2) initial options I would at least go with the 425.
Yep, if you have proper placement the flow should be fine. The 425 would be the minimum I'd put in, I have 2 425's in my 20g and they don't even reach the opposite side as far as flow.