I was concerned, because mine came in at about 1/2 inch long, and they were in a tank that had 5 Tin Foil barbs that were 6-7 inches long… Tin Foils were very civil, but the lil Pandas would swim up, and take the food away from the Tin Foils… brave, or stupid, they certainly are interactive

My current rope was 7-8 inches when I got it going on 2 years ago and is still the same size. I would wonder if they restrict their size according to water volume, like a leopard shark, as I've never had one in a tank larger than 55 gallons but a friend had a couple in a 175 gallon tank and they were the same size as what I see.