Reds do grow fast. You really cant even tell. Well I can't because I see them everyday. But when I have a friend that sees them maybe once every few weeks. They can tell they have grown a lot.
I have a spilo and I got him at 1" and he is already at 2+". I mean since I see him everyday it doesnt look like he has grown much but when I think back to how thin he was when i first got him, he has grown a lot.
I love how fast reds grow. I have had these boys for about a week and a half and they are still in that quick growth faze and my friend said that he can tell they have grown. I see them all the time and think that they just got fatter, but i am sure they gained some lenght already to. It's not uncommon to have reds grow about a quarter of an inch a week when juvies. Mine will be be bigguns before I know it.