I got a 4" peacock mantis for my nano on sat, but it hasn't really wanted to eat. I'm pretty sure my 6g nano is not big enough now, because it looks a bit cramped. I am looking for a 29g tank for it, but what should I do in the mean time? I have a 20g sump for my 55g reef that I could put it in. It has not displayed any aggressive behavior that is usually characteristic of peacocks. It won't even eat most of the hermits I put in the tank. Tried feeding frozen mysis, and it wouldnt eat that either. I know it's supposed to take a few days for them to get adjusted, but this just seems too long. Any advice would be gladly appreciated. I don't want to see any harm come to the little critter.