Remove carbon.
Add 2.5 milligrams per liter of water.
If you are using the powdered version, it is difficult to dissolve. Predissolve in tank water by shaking it up in a small container.
Dosing
Day 1 -- remove carbon, perform water change with vacuuming, and add Prazi to tank
Day 2 -- add Prazi
Day 3 -- do nothing
Day 4 -- do nothing
Day 5 -- do nothing
Day 6 -- add Prazi
Day 7 -- add Prazi
Day 8 -- normal partial water change with vacuuming
Day 14 - normal partial water change, then add prazi
Day 21 - normal partial water change, then add prazi
Day 28 - normal partial water change, then add prazi
Day 35 - normal partial water change, add carbon, treatment is complete
If you need to do a water change in the middle, then redose prazi per the water volume replaced although as prazi is a very mild treatment, it is very hard not to overdose at all.