Where did you end up placing the Tenius? Couldn't really pick it out amongst all the other colors and corals in the full tank shot.
I'm sure the Purigen will help to remove some of the cyano but how is the flow overall in the tank? I'm sure you know but it's usually caused by either a lack of flow in a certain area or an excess amount of nutrients. I would think in your case, since you do really frequent water changes, it is more of a flow issue than anything else. Just surmising though...
Those blind shots are really cool as well. Although the mini nems weren't found, it looks like you have quite the biodiversity in your tank....loads of sponges and feather dusters.
Thanks for sharing the pics....keep things updated on the cyano and the new frags.