You can make the 55 gallon into a sump if you wanted or any tank for that matter. First you will have to decide if your getting the display drilled or having a hang on overflow to get the water to your sump. Then you will need a skimmer in your first chamber of the sump then your refugium in the second . And the 3rd section holds your return pump to get the water into the display tank. That's the basics really. Check you tube for videos on them you will figure it out fast after watching them.
Feed your Filtration
Give it to Porc Chop he'll eat anything!!!!!
"This is my tank and these other fish just live in it"
^ Quoted from Porc Chop^