The little guy has already grown a lot in the switch to frozen food
Maybe he just wasn't a good hunter or something
They moved into the growout today so I bet that will help too
The angle didn't catch the color real well, but all the bigger ones have red steaks in their anals and caudals, and completely red ventrals. If you look close on the bigger one there, his caudal shows a little color, but it looks more orange on camera
Also, in their defense, they've had the lights off for about an hour when I noticed those two together, so they are a tad pale from that as well