Pseudochromises bully gobies. Gobies are rather passive fish while, as you've unfortunately discovered, pseudochromises aren't. You'll have to either pull the pseudochromis out of your tank or drop the goby getting idea. Or this could be a great excuse to set up another aquarium for more passive fishes
PS. i love gobies which is why i don't have any pseudochromises.
125gal. megaflow. Fish Residents:
Yellow Tang -(Junior), Flame Angel -(Flamey)
Bicolor Blenny -(Butch), Randall Jawfish -(Jaws)
Lawnmower Blenny -(Lenny), Talbot's Damsel -(Dottie), Tomato Clown -(Ketchup)
Nameless fish include, Neon Blenny, Singapore Shrimp Goby, Yellow Tail Damsel, 1 Skunk Cleaner Shrimps, purple pseudochromis.