That is crazy that you can see how clear it is from that far away. Looks like a shadow from the FA. Congrats on the clear water. I'm no help on the diffusers sorry.

The people who say I can't do it can just sit the @^#% down and watch me. Friends call me Rusto I also subscribe to pond boss mag. http://forums.pondboss.com/ubbthreads.php?ubb=showflat&Number=504716#Post504716