Nothing much.
Worth mentioning that I'm thinking of buying new furniture. Anyone with experience with rattan? I'm eyeing something like the furniture from Garden Centre Shopping. Looks high quality, and it's weatherproof.
As far as I can tell you're experiencing the moving fever of bucephalandras.
They can experience "melting" when moved to a new tank, especially if they're used to different lighting conditions. This is a natural so it should take some to fix itself