my thinking is this if the fish is still stuck till now there is no way of knowing when the catfish will let go of the cory or if it can. imo it is better to be safe than sorry and see if you can catch the catfish and get the cory out because if the cory is stuck due to the spines on the fins i don't know if can be dislodged by itself. not only that if there is an injury the longer the cory is in the mouth the chances of infection may be greater. you could lose 2 fish in the end.
the catfish eats by swallowing so it could be stuck.
this is just my opinion, but good luck...catfish are big eaters and if a fish can fit in another one's mouth it usually becomes a meal.
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