You learn as you go. Tomorrow should be fine and to answer your question, yes you must remove the purigen before using.
So get something different. Like a Zullie or something to replace it. My plan is to try and collect one of each. I only have 2 so far lol
Ill get more but nothing expensive unfourtunatly. My wallets hurtin right now. Just bought a 3500 engagement ring & My daughters bday party this weekend. PLUS I have a week trip up north to do some fishing in two weeks. TBH Ill probably order some more Os. I like em.
Should had practice with some Farmies, 8.99 each over here. 2 Pbass will fight eventually FYI
Just once. I usually treat for 5 days then do a huge water change and then treat for another 5 days.