Help, I have a beatiful zooanthid rock that has been in my tank for the past 3 months and has been doing great. last week a section right through the middle stopped opening and just seems generally ****ed. Everything in the tank looks great, the salinity is sitting at 1.025 like always, and my PH/Alk/Calcium are great. Nitrates are at 0 and nothing else is bothered by anything.

I first thought it was maybe too much or too little water flow and moved the return around, but nothing has changed. also thought about the lights, but the zoos all around my tank seem great, including ones with the same general location/orientation to the lights.

I am going to do a more detailed water testing tonight and will post my results then.

Any ideas?

Here is a pic of what I am talking about.
zoo problem.jpg

Here is a pic of my zoo plugs at the bottom which are happy and multiplying

happy plugs.jpg

here is an overall pic of my tank, note the mad zoos just above middle water column dead center in the back of the tank.

whole tank.jpg