I got a small group of normal females that I regret getting. They had all just laid, so the plans I had for them that season were all bust, and honestly, they have mostly been a drain. I should have started with more morph females. I also bought a female normal who was so mean that one day she broke her own neck striking the side of her tub because I walked past the door of the snake room. I had tried everything with her to tame her, or calm her. I even blacked out her tub but was getting struck when opening it because I couldn't see where she was lurking. She was a good eater though.
Probably regret getting so many BPs in the early years, when I could have gotten just a few higher quality animals.