I'm having some problems using this skill, I've unlocked and I've got Collectible items I don't need... yet... there's nothing for me to use it on which is baffling. Did I do something wrong or missed something?

I got this Collectible "Whilom Catfish" which has a Collectability of 290 which is too low to turn in so I thought I could reduce it but I can't as using the general action Aetherial Reduction doesn't have it on its window or there's no option on the item itself to do it.

I even have the Pearl Sprouts at 396 collectability as well and a few other items like the Light Kidney Ore and Sorcerer Fish too, but I really don't understand this.

What am I doing wrong? How do I use Aetherial Reduction on these items?