The sump can be made, depending on what you want it to do
1- what skimmer do you have.
2- what return pump do you have.
3- what is your dt size
4- do you have an internal over flow, or external.
do you have a overflow box on the 55 or a hob skimmer??
With what you are running now are you happy? how long have you been running it this way. The only reason why I ask is. If everything looks happy and you have good results. why spend the money??