When I brought my newest FB twins home I saw one was skinny. He was in shock seeing his new home..I don't think he ever saw a plant or driftwood before. He may have thought he was free because my tank is natural. He stared a long time (maybe he had a long ride on the truck getting here) and he came around and is ok like the other three. He gets extra worms offered. I think he has gained weight and thankfully is doing fine. They just got new crickets today and I wonder why the store never has crickets on sale but most everything else is. They are 10 cents each no matter what size.