HELP with Identifying issue

[AQD_ottawa]

Hi

Hoping someone has seen this before and can shed some light on this issue.

Bit of history first before the photos.

Tank is ULNS been running for 18 months, dominant SPS 24x24x24 cube. About 6 months ago my (always moody) hairy green stag started to go patchy would loose some flesh then grow back, then the flesh started to get pale, then patches of skeleton showed. I out it down to just becoming weak.

I now have the following apearing on various corals whcih looks like wounds opening, or NCS

Now I want to think the issue is due to a crach the tank went through 8 weeks ago. While away my main pump tripped and the tank temperature dropped to 21 degrees C for 2-3 days and my ALK plummeted to 3DKH and Ca dropped to 200 due to no supplements reaching the main tank.

All parameters are back up to normal and corals have coloured back up although I lost some big specimens.

My concern is if this is not due to the crash, what else could it be? Logical thought says its some sort of delayed reaction, but I would like to see if anyone with more epexerience could shed some light on this?

Thanks for your help

 

[M007]

My thoughts would be something released by the dying specimens that settled on the affected areas and stuck there. Also with a mass die off and permam crash there would be a serious system imbalance that would weaken the the survivors immune systems. I have seen this happen to a porites mound I have but with continued stability it survived and healed. Given the severity of the peram change I would suspect it will take more that 8 weeks to get the system back to normal.

 

[AQD_ottawa]

Thanks for the help.

I just took this photo after giving the coral a medium blast to see if any nasties started to wriggle, nothing is apparent but the flesh looks bleached and this is the underside.

In the above photos you can see the hollowed out original damage half way up the stem.

Most of the areas other than one doing this are underside. I cant imagine it being lack of light running 160w of LED Crees though! Keeping my fingers crossed it is after shocks from the crash as anything else will be hard to cure.