Fish and catfish in particular need no actual teeth to cause damage, e.g., break off or tear off ALL fins including a tail, remove skin, eyes, barbels, or even kill, e.g. by swallowing or by suffocating or by effecting constant stress, etc.
Wyckiis are quite unfussy. They eat ~ any common fish food, dry or frozen-thawed or fresh, pellet, flake, fish, crustacean, insect, etc. I'd read up on their profiles if still unsure.