I have never had angel fish, but have had various sized tanks most of my life with fancy goldfish. When I have a yard (which I do not at the moment) I usually have an outside pond...nothing too huge (100 to 200 gallons at most). I currently have a 70 gallon tank, with 5 large fancy goldfish.
I just wanted to say that I have that EXACT tree stump decoration! I cut it in half, top to bottom, and use the two pieces to cover and hide the big pipes that serve to pull water into and out of the power filter. It is actually part of a series...I have another matching smaller stump, and two logs.