47 gallon tall aquarium

[windcoast reefs]

Hey everyone, I came across a good deal on a 47 gallon tall aquarium. Does anyone have any opinions on making a saltwater tank out of this? I would be using 2 t5's and 2 250 LED light panel to light it (will be getting a second bank of t5's in the new year). My end goal is to only have a few clown fish and some gobies mabey a fire angel. I have heard that the taller tanks are not so good for oxygen exchange so you cannot have so many fish. Is anyone has had any experience with taller tanks, it would be great to hear you input.

The tank is 20" tall, 18" deep, 30" wide

Thanks!