For Neo, you would want to stretch that out a bit; 1, day 7, day 14 and day 21. I used to use 8 or 9 day spacing, but that didn't work quite as well. However, even with careful spacing, Neo often slips through. It has been shown that even a single egg can restart the infection.
Are you aware that multiple treatments with prazi causes growth of a bacteria that consumes later doses? this renders multiple treatments ineffective. I've seen that happen at even 4 doses. For severe Neo infestations, I've gone to using hyposalinity, at a specific gravity of 1.012 for 30 days (no inverts of course). That works much better.