No, sir, there should be no need to treat the goby.
The quarantine period recommended by the Shedd Aquarium for wild seahorses is 30 days but that’s not how long you need to administer the fenbendazole to treat your seahorses for worms. One treatment with the fenbendazole added directly to the water is sufficient to eliminate worms from the aquarium, and a few days of feeding them adult brine shrimp soaked in fenbendazole should do the trick.
Fenbendazole shouldn’t have any affect on copepods are Gammarus amphipods since it’s a dewormer.
I use fenbendazole soaked Artemia (adult brine shrimp). Protocol is 0.25grams fenben per 100grams of wet weight Artemia in sufficient H2O to allow the Artemia to live. I should think that just a few days of feeding them the adult brine shrimp soaked in fenbendazole should suffice to cleanse them both worms, Chris.
The snails and camel shrimp are excellent tankmates for seahorses, sir.
Pete Giwojna, Ocean Rider Tech Support