ACN rotation help

[Kevee]

I'm confused. I thought bio is on GCD?

I'm talking about Fester.

If you do Bio -> Miasma/Bio II -> Miasma/Bio II

You'll be doing fester after that Miasma/Bio II, and you will be on the GCD, and your next action is delayed. Using this rotation it will happen more often, which is what you DON'T want to happen, and the timers don't work as nicely as the rotation I posted.

Edit: Also, Bio does more DPS but less damage per cast. There are a lot of times this is necessary(along with the longer timer coming first being nice).

Ifrits jumping up to do his charges. Would you rather have Bio, or Bio II? You'd want Bio II, because after he lands you only need to apply Miasma/Bio before being able to use Fester again, whereas if you applied Bio then you'd need to re-apply all 3.