I think carpets and bulls are great beginner snakes. Those are two of my favorite snake species. Some can be a little nippy when they're young but most settle down pretty quickly. They're both pretty easy to care for but like you said, bulls are pretty fool proof. Low-mid 80's for a hot spot and ambient temps are perfect for the cool side. If you want a larger carpet you should look into Coastals or Bredli. I love carpets for their semi-arboreal tendencies but you do have to keep them a bit warmer than colubrids. Either species would make a great beginner snake IMO. Best wishes with whatever you choose.
My female bull will be 4 in September. She was 42g when I got her. She's easily 3kg now.
My male Coastal Carpet just turned 3. He was 85g when I got him as a yearling. He's a little over 2kg now.
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