This is what I bought from Brian :
Acrylic sump for sale w/overflow box and built in skimmer
External dimensions: 24”w x 11.5”d x 16”h (approx.19 gal total).
Overflow box includes 3/4” diameter u-tube and flexible tubing that hooks into sump infeed.Skimmer, located in infeed section, is venturi style – pump not included.Sump designed as wet/dry (bio-balls included), but could be modified for other styles.
Not sure what kind of pump I would need or even how many. I'm fairly new to the Saltwater hobby. I have a 55 gallon tank and need to buy a pump for my sump...hopefully one that is fairly priced, because I'm low on funds. Thank everyone.