I have never seen any time that you would need to use both PP and Proform. They both kill the same parasites. I have not seen a lot of use of Bifuran, so not sure of how good it would be. If it is an antibiotic, then it will likely hammer the bio bugs in the bio filter, causing you to have to go through the cycle again. The Tricide Neo is an antibiotic that can be used dry as a topical, or as specified on the container as a bath, or my preferred method as a spray, treating in a container outside the pond, then rinsing so the antibiotic is not hammering the bio.
Zone 7 A/B
Keep your words sweet. You never know when you may have to eat them.
Richard