Need additional information. Is the 55 gallon tank drilled? Overflow box? What is it rated? Where will it be located? Is the 10 gallon sectioned off? What do you want in it?
Main thing is to match the overflow rate with the return while considering head loss. I have a Mag 9.5 pump running a 20 gallon long refugium with three chambers. The overflow is a CPR rated at 800 gph. List of items are: Overflow box, drain tube, sand/mud/rock/calerpia, and a return pump with plumbing returning to the tank and a water disperser (whatever they are called).