ray-the-pilot:
To keep things On-Topic, I moved my message to the other thread.

But I kept here my opinion:

-With controller the PH will not fluctuate much, maybe 0,2PH(?)
-Without controller you have bigger PH fluctuation, maybe 1PH,
but you will have the same death/hot spots than you had with controller.
(if moderators wish to delete this post, no problem!)