Keeping tank clean with a trigger

[howdy20012002]

Well, i purchased yet another tank..77 gallon..and it came with a picasso trigger.
Apparently he likes the taste of inverts.
Any suggestions on how to keep my tank clean?
Would blue legged hermits be safe?
I will be testing that theory with a few and see how they last.
However, i am just wondering if anyone has any suggestions as to how to deal with this?
any help would be greatly appreciated
thanks
Neal