Most fish do better with alot of oxygen in the tank.
I use two Fusion Air Pumps (rated for 110 gallons each) in my 55 gallon tank.
Course I'm a Freshwater fish person......you might be saltwater....Don't know.
I use two koralia 750's powerheads in my 55g but you can go with the 750's or 550's if you are fish only.
__________________ 180g Reef - 60g Rimless Reef -90G FOWLR- 125g Malawi Cichlids- 40bREEF- 34g Fresh Planted-working on- 20L FOWLR- working on
I have a mix of many different saltwater fish amongst my tanks, but I love my Tangs most of all.