Have a pair of Swallowtail angels that made it through copper 30+ days and 2 rounds of Prazi 7 days apart. No visible signs of any diseases during QT. Now in observation, both periodically will flash repeatedly on their nose area against the pvc in QT and will also do a head twitch. Sounds like it could still be flukes. Did a 5 min dip with saltwater but with salinity down to 1.012. Didn’t see anything in the container that looked like flukes but thinking it might be the undetectable types. Any advice on next steps? Thinking of trying hypo for 30 days. Thanks.