hexagon tank

[Psychocircus91]

So I am considering starting a fancy goldfish tank. I am interested in getting a hexagon tank. I know they are not typically ideal because of less surface area. I was curious if the bubble walls or bubble stones add any oxygen into the water?

 

[BHead707]

what will add oxygen is getting the water to circulate and reach the top of the tank(cause thats where it will pick up the oxygen). so i guess a well placed airstone might work. will you have a filter for it?