Blenny chasing Firefish

I'm not sure what to do, I think I made a regrettable decision. My LFS had two fish I really wanted, a midas blenny and a purple firefish, so I got them both and I have them in a 30 gallon QT. My LFS guy said they'd be fine together but I shouldn't have listened to him because now the blenny is chasing the firefish around. It doesn't look like he's actually taking fins off but just harassing. How do I know if the firefish is too stressed until it's too late? Should I try to take one back? They've been together a week now, and I wanted to do 4 weeks of cupramine. Any advice? I have lots of PVC for hiding. This is a 30 gal long tank.
 
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