Black Algae, now this! Zoapox on paly?

[triguy]

In the past 2 weeks, I've had about 5 frags melt away due to some weird black algae/fungus. Then I started seeing my Happy PE colony start to dwindle. No sign of black algae, but noticed what looked like zoapox. I was almost certain zoapox does not affect palys. So, what else could this be? I went ahead and dipped in Furan and Coral Rx then cut away infected/dying polyps. I used my scapel to scrape at the white areas and they all were somewhat hard. Bottom two pics. are what I scraped off.

 

[Dana42078]

i had the same stuff on a large frag that has been growing great......at first i thought it was one of those pest starfish....now that u got a good pic that was also on mine and mine have dwendelled away in one spot. I def dont think its nudi's

Edit: I literally had to scrape it off.......ive dipped all my frags multiple times and never had one pest.

 

[Reef Bass]

Maybe some kind of sponge?