with your current inhabitants the achilles would be to stressed out.
I have my achilles in a 125gal with 2 clowns, a royal gramma, and lwanmower blenny. AHe originally was in the same 125gal with a LN butterfly, yellow boxfish, and hippo tang. i had a major disease outbreak, lost the box and butterfly, returned the hippo and kept the achilles. I've had the achilles for 2-3years now.