I would wait, watch, and see. I used to have the opposite problem...if I put a pep shrimp in with the H. reidi I used to keep, the shrimp would be horse food by the next morning. They would descend on the shrimp, corner it, and take turns snicking it and ripping it apart limb from limb. It was a macabre, but fascinating, thing to watch.
If these guys are getting too big for their breeches, you may have to re-home them. Just keep an eye and see how much they're stealing. I worried about this when I made the decision to keep the mandarins in the horse tank, but they're not nearly as aggressive as shrimp are when it comes to the dinner bell.