1 have two and they were the same size when I got them, about an inch long. I got them about 3 months ago and one is 3 inches long and the other is 6 inches long. Amazingly fast. The big ones quite a bully and hordes all the food and won't let the other eat, wish I only got one, but the LFS said they don't like to be alone. I haven't seen them " bonding" since I got them. lol.
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