LPS "RTN'ing"

[holdyourlight]

Weird!

If it was low alk or lighting stress, even both, I still don't think you would see what you described happen.

The challices would be the first to bleach, then recede. Favias would bleach, but probably not have tissue recession right away. Acans would close up, maybe bleach, but not recede or RTN.

Mass coral die off of many different species when all parameters are good is usually some toxin poisoning the tank. It doesn't necessarily have to be man made or introduced, once I had all my acros die from a sinularia dying. It only affected the acropora, no other genera.

Maybe i missed this, but is the frag tank plumbed to the main tank? Or separate? When you say they RTN, did you see brown jelly on everything?

frag tank is separate and no brown jelly either, just perfectly healthy coral to dead white skeleton overnight. the revive stopped the receding on every coral i dipped and moved to the frag tank.....
:ooh::ooh::ooh::ooh::ooh::ooh:

 

[Keiki]

Any big temp swings? A friend had the temp go up to 87 for a few hours and had alot of bleaching and loss in lps. Lost some zoas also.

 

[holdyourlight]

Any big temp swings? A friend had the temp go up to 87 for a few hours and had alot of bleaching and loss in lps. Lost some zoas also.

Nope
have a Ranco on the sytem, temp stays between 79 and 81

i could still never figure out what was wrong so i shut this tank down :(

in the process of restarting

all of my corals and fish packed into a 33g in the meantime:cry: