What size tank is that? 50g?
Where do you figure that's a 20g? Looks more like one of the "show" style tanks, meaning it's not super long, but is taller than usual. I'd guess 29g tall or 60g tall... Hard to say without input from the OP, so lets not jump to conclusions that the tank is too small...
It's a 37 tall and the dimensions are 30Lx12Wx22H. The angels are a very small they are a little bit bigger than quarter size. and I am also getting a lager tank in a few months. Yes I know it's small for 2 angels. I am working on a doing a larger set up once I get this one just right as far as the plants go.