Actually, I purchased 3 very small angelfish (little smaller than quarter size) to put in my 10 gallon until I thought they could go into my 33 gallon. I cant remember why I didn't put them in the 33 gallon in the first place, but after about 2 weeks I figured they could go in, so I put them in my 33 gallon. I've never had any growth problems with them or anything. But, you better have a bigger tank ready to start cycling before you even think about buying angelfish!
Sean