You can certainly dose the prazi, but that's only going to treat for flukes and other external worms. It's not a bad idea to treat for flukes on all new fish. But the cause of the swelling on the eye is something we want to know. Is it just one eye or both? Is it cloudy? Odds are there is ick in the tank now and the swelling is from that. You'll want to treat the cause to keep it from happening again or getting worse. You may need to treat the fish with antibiotics to get it to heal, but for now we can treat the cause and see if his immune system can heal it on it's own.
It is only one eye and it is not cloudy. So if I dose copper do I have to get another tank to do the ttm? Also are clownfish or blennies sensitive to copper? Can I dose prazi and copper at the same time? Thank you all so much for your help!