I've been having some issues with my tank for the last week or so... first, this happened to my candy cane:
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Then, some of my zoos stopped opening up for the last couple of days:
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And this morning, I woke up and THIS HAPPENED!!!
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There seems to be some kind of white spongy fungus-like growth on one of my zoa frags.

This is a 12 gallon tank that has been set up since August. I typically do water changes every 1 - 2 weeks and change my floss every 2 - 3 days. I have 2 clowns (that don't seem to be stressing), and the rest of my corals are doing fine. My water params are as follows:

Temp: 78F
Salinity: 1.023
Ammonia: 0
KH: 40
PH: 7.5
NO2: 0
NO3: 20

Sorry, I'm still new to all this so I hope I've provided enough info. The only thing I can think of that has changed in the last month was that I removed my Koralia Nano power head and now rely on just my pump for flow (stock pump that came with the Cadlights tank)... am I maybe not getting enough flow now??

Hope someone can help, thanks in advance!!

Your Ph is low and your nitrates are high, I would work on straightening those out.
They probably stressed your corals to the point that they got infected.
To deal with your immediate Zoa problem, I would recommend a lugol's iodine dip as described here:
http://www.nano-reef.com/forums/index.php?...t=0&start=0

Thanks for your help!

Um... Mods, can someone please move this to the proper subforum? I have no idea how I got this posted in "Reef Cleaners". Oops!