ok we have to back track a bit.

What size tank were they in? Filtered?
Substrate? Diet and how often were they fed?
How often do you do water changes (before and after?)

What size is the new tank? Is it filtered? If so, was the filter cycled?
Substrate? Diet and how often is he/she fed?
Temperature?
Water changes? How big and how often?

Can you post a picture?