LPS flesh shrinking

[kinerson]

It started with my open brain coral shortly after I plummbed a new section of my recirculating system to include a grow out tank. I noticed the flesh was begining to pull off the outer egde of the skeloton. I guessed it was caused by the PVC glue used in the added plumbing. That was about 6 weeks ago. Since then it has continued to peal off the skeleton and now MOST ofl the other LPS are showing signs of the same.

Any thoughts or ideas? I've been changing about 10%-15% of water (RODI) a week. My parameters are all good. I still think it was triggered with the added plumbing/system. Thats when it all started. I guess I'm surprised that after 6-8 weeks the other LPS are begining to show signs as well.

Greg

 

[XeniaMania]

Maybe carbon to help remove pollutants in the system?

 

[MiddletonMark]

I'd really like more info about the system, lighting, flow, and the complete water parameters, please

 

[kinerson]

Yes of course, I appreciate your consideration.


Display is a 150gal
Lighting is 2-150w hallides 1400k coralvue and 2-180w uri vho actinics
The LPS corals are all placed on the sand bottom.
Water flow is created with 1 seio water pump rated for 1500gpa and 2 return lines coming from sump (about 350gph each)

alk 2.75 meq/l (lower then i thought)
ca 370
ph 8.4
temp 79
phosphate and nitrate undetectable

My skimmer has been running a little harder then normal. A very large mexican turbo snail died about a week ago which did not get removed for about 5 day's. The receding flesh from the other lps corals was noticed around this same time.

I also have a refugium built into part of my growout tank that I added 6-8 weeks ago which helps alot in keeping nitrate and phosphate low.

Greg