A lot of folk have had success with peppermint shrimps or a copperband butterfly but they can be hit or miss, more of a miss on most ocassions tbh. There is also the Bhergia nudibranch but the trouble with this is that it only eats Aips so unless you want to cultivate Aips you're dooming the nudi to starve once the problems gone.
The best way in my opinion is to treat them with treatments available such as joes juice. Again some people use lemon juice in a syringe squirted directly in the Aips mouth
Yes the majority of copperbands die within months of being added. This is because most of us cannot cater for their care and requirements, myself included. I know people who have kept copperbands that have lived a lot longer than the odd month or two and been healthy and well fed with it.
I neever suggested for one moment that the op go out and buy one but the question was asked if there was anything that ate Aips. I would kinda hope that people research livestock well before committing to its care