Decorus must sport:Nice cats. You should be able to see that the two main barbles are bare ( plain and straight) and have no additional tiny branches like the others do. This will be the main way to tell between sp_hybrid 5 ( sp. Valentiana ) and decorus.
You can expect similar growth rate and size to multipunctatus, maybe an inch larger.
A shop in this area had a few of those.Thinking at first that they were Synodntis decorus they caught my eye but they were labeled with some other fancy name.Not S. decorus, the tail pattern is all wrong. But close. Looks to be the hybrid Synodontis sp. valentiana, which is a hybrid between S. decorus and S. multipunctatus