Is This Tank big enough for 2 African Clawed Frogs?

[tgampper]

I have been looking at 20 Gallon (90 litre) tanks is that enough room for 2?
Also how often do you feed your frogs and how much of it?
And should i get 2 males or 2 females?

Clawed frogs are wonderful! If you get a male and female, get ready for some wicked singing Both males and females will call. The male has at least 4 distinct songs, the female has 2.