The panda cory is fine in your tank, you could get him a few friends to reduce his stress.
www.seriouslyfish.com
The honey gourami (1 or 3, how many are left?) is also fine. Your only issue is the pleco, try to rehome it.
Corydoras panda (Panda Cory) — Seriously Fish
www.seriouslyfish.com
