Small angels do best growth wise if fed very very small meals 3-5x a day which isn't doable for most people. And when I say small meals I mean a pinch. I always raise my angels in smaller tanks with no substrate so I can feed more often yet keep their tank clean. Also remember if you feed the little ones the big one will be eating too. Plus angels are like people in the sense they all grow at different rates and grow to be different sizes.