Zoa polyps turning brown?

[Cole_Voeller]

Hello! I have a couple zoas that have been looking weird lately. I moved all of my zoas from my main tank, to a new frag tank with different lights. Tank is cycled, though it’s only inverts atm so I’ve been feeding them. Likely not enough nitrates. They all opened after a couple days of the transfer, though a couple of them don’t look to hot. The polyps stay closed and are covered in a brown film. Anyone know what I can do about this, or how to prevent it? Thanks for anyone who can help!

 

[davidcalgary29]

Pics of entire tank, please!

How are these frags situated in your tank? And what's the PAR level?

 

[Cole_Voeller]

Can’t get pics at the moment unfortunately. I can describe it for now if that works? 20 gallon long fishless, egg crate frag rack, ton of rock underneath egg crate. Penguin pro HOB, circulation pump aimed at surface. Frags are about 5 inches off bottom I’d guess? Mostly all zoas, a few mushrooms, symbodium, only soft corals. Those two zoas are the only ones with problems. For lights, I have two Current Marine Orbit LED.
https://current-usa.com/collections...stem-with-loop-wireless-control-24-to-36-inchI have absolutely no idea what my par is unfortunately. I just know this light is for softies and lps.