This is what I would do in your shoes to keep it simple:
Step 1) Ensure fish is eating. Once that has been confirmed, begin CP treatment for 30 days at a dosage of 40mg/gal.
Step 2) After 30 days of CP, run carbon & do a large water change to remove the medication from the water.
Step 3) Dose Praziquantel (7.5mg/gal) and Metronidazole (25mg/gal); repeat dosage in 48 hrs. Wait one week, do a 25% water change, and do two more rounds of prazi & metro as outlined (spaced out 48 hrs).
Step 4) Fish is now ready to go into your DT.
I personally wouldn't use acriflavine, antibiotics or perform FW dips unless you see there is a problem that warrants it. And that is something we can advise you about on a case-by-case basis.