Yes the Gyre kicked debris up and thus po4 rose. What made this possible is that I had placed the Gyre vertically rather than horizontally. This helped kick up a ton of debris. Also, I did not realize how many the dead spots I had in the tank until I add fuel saw the actual flow of the water.Do you think the gyres just did a better job of suspending detritus so making po4 rise?
Ive seen gyres in vidoes never owned one so I would be intrested on your prospective concerning their effects on the tank in general and what specifically about them compared to other wave makers that could effect p04 as you mentioned.
I'll add some pics later.