skin flukes....yet another joy of reefing

[Delphinus]

He looks better today, but still has a way's to go. I did find some Prazipro in the end yesterday, but decided against adding a second treatment just for the time being. So today he looks better, his face has cleared up, but there is still the grey discoloration spots on his backside so I assume he's not 100% healed up. His eyes have cleared up. There are a few suspicious spots though (mostly on his fins, one on his chin under his mouth) and thus I'm considering a second treatment, although now I'm not sure if I should use the liquid Prazipro I just bought or try the Praziquantel again (as per RC I understand Praziquantel is a much stronger dosage).

The tank itself looks like sewage (film algae over everything) but this could be due to the skimmer and carbon shutdowns more than the pharmaceutical itself. I'm unsure if I should do a water change first and then a second treatment or whether I should just add the second treatment now and then do the water change later in the week (and reinstate the carbon and skimmer and stuff).

Any thoughts?