There are 7 roaches living in a 20 gallon. They have wood chips for substrate, and a shallow water dish to drink from. They get fresh fruits/veggies/cat kibble each day, nothing rots inside. It's fairly dry.
I dont know what is causing this but they are over 2 years old, it cant be due to illness or they would have died long ago. 2 years is very long for Fusca to live.
I'm thinking they have excess oils due to there diet, they get protein (cat kibble) everyday with there fruits and veggies.