Hi,
They were tiny when I got them, don't know the metamorphosis length. I can tell you that the quite dry head/snout of especially the smallest one has worried me.
The smallest one also had a pretty bad infection in the leg just after I got him, I had to give him special attention for a while and separate him from his two siblings that were bullying him a bit.
Now they are all eating pretty well, I try to feed them every day with thawed bloodworms and sometimes worms, they are still a bit sceptical to worms. Just a size thing though.