Looking good! They are about the same size as my recent pups and they even look alike (apart from 5 out of 6 of mine having a small part missing in their disk in front of their mouths). Have you tried feeding them live black worms? Mine really loved them until I switched them to blood worms and market shrimp (and occasionally minced up market prawn).
How big is your swimming pool/pond that I see in the last pic? I'd love to do that in my basement if I had room.