The challenge is you must have found 25 fish caches
The challenge is you must have found 25 fish named caches, Names of fish must be species names like trout, salmon, tuna ect, a cache name Charlie will not be excepted unless the cache name is "Charlie the tuna"
and can be a cache with the word fish in it as well
There are simply too many possibilities to fit this in the config of a checker. A special script and a json file of names have to be made for this challenge. But given that this challenge is not allowed anymore there might be nobody who is willing to spend time on this