I would suggest you rethink the size of your new tank - a 55 won't last long before a motoro gets too big for it, plus you need a bigger water volume to ensure your water quality remains stable. Check out the site, there are numerous threads giving good advice on tank size, care, etc.
You mentioned "death curl" in another post - if it's in a 10 gal you probably already have problems with ammonia - need to test water asap.
What's your water change regime?
Is it fully cycled?
Unfortunately, IMO you'll need to get it into a bigger tank very quickly if you want it to survive!
Good luck!