Zoas don't seem very happy

[remix8315544]

I bought these about a month and a half ago. There were 3 pieces that I clustered together. A small piece the Zoas melted away but the others seemed fine. A little over a week ago they were all closed up for several days. At first I thought it was either my shrimp or snails that were causing it but now I'm not sure. All other Zoas and Palys seem fine.

75 gal w/20 gal sump
Parameters
1.026, Temp 78.5, 0 nitrates, .03 phosphates, PH 8.0, Alk 7.7 (a little low), Calcium 450, Mag 1345, Lighting - Reefbreeders 48" LED (ramps up from minimal blue at 7am to aprox 50% blue 45% full spec for about 2 hrs mid-day and back down to minimal blue by 11pm off from 12 mid to 7 am), Tunze in sump skimmer, 2 Jebao powerheads alternating flow.

I was running a BRS dual reactor with GFO and Carbon but I just took that off. Still running a small amount of Bio-Pellets. I dose Kalkwasser in my auto top off.

Before and after pics attached. Any input is appreciated.

 

[cloak]

Have you checked them for pests yet?

http://www.coralpedia.com/index.php?module=Gallery2&g2_itemId=384

 

[Jone]

tanks size,lights,,sump or no sump,,skimmer? water params ???

 

[remix8315544]

cloak - yes I have, but the link you sent me has some I may not have recognized. I'll check again. Thanks.

Jone - Tank info and params are in my original post as of yesterday.

I am going to do a water change today and will take these out for a Revive dip at that time.

 

[remix8315544]

Some improvement after the dip and water change. I have read several threads about having too clean water. Is this something I should be considering ?

 

[Dendros]

Some improvement after the dip and water change. I have read several threads about having too clean water. Is this something I should be considering ?

I'm in the middle of this problem and yes it can be a problem. I have an sps tank with zoas and just recently moved them all over to a new tank with higher parameters. They immediately opened up all the way and look way better.