You are using gdex at the moment aren't you? The instructions say to do a water change on day 5 of up to 50%. And if necessary, repeat the three day treatment starting on day 8.
With ndx, it's a 1 dose course and you do a big water change after 24 hours; and if necessary repeat 14 days after the first dose.
Yup, I’m currently using gdex.
I am asking just in case I need to do water change before Day 5, hopefully not!
The instructions say repeat dose (Day 8+) for tapeworms I think,unless I am mistaken?