Bleaching Corals?

[reeftx]

I am losing two corals to what appears to be bleaching. Ammonia and nitrite are undetectable, and nitrate is low. Phosphate is about .03, salinity has gotten out of whack at 1.022 (I am slowing raising it back up), magnesium is 1250. Calcium is 400, alk is 11. Ideas?[attachment=2]IMG-20111219-00032.jpg[/attachment][attachment=1]IMG-20111219-00033.jpg[/attachment][attachment=0]IMG-20111219-00034.jpg[/attachment]

I added a poly filter last night.

 

[reeftx]

I was at 1.026. My guess, only a guess for the drop in salinity is I did a 15 gallon water change (210 gallon tank) about 10 days ago. I did not (I should know better) test the water I got from the store. My guess is one or more of the buckets was fresh, not salt water. However, the birds nest just started belaching in the past couple of days.

 

[reeftx]

I have had both corals 6 months or more, and there are other corals (SPS, LPS) in the tank. I will try to get my daughter to take a pic later this morning to post.

 

[melev]

Possibly a temperature swing?

 

[reeftx]

My temp is usually within a few degrees of 76. The rest of the tank is attached.

 

[dfwminis]

@reeftx wrote:

I bought saltwater from a store once, a long time ago. Salinity was 1.021. Never again did I buy saltwater from a store.

 

[DFW]

I found what seem to be very good articles about this.

http://www.advancedaquarist.com/2002/2/coral

http://www.advancedaquarist.com/2002/4/coral

David

 

[Guest]

Even if you put all 15 gallons fresh RO water in a healthy 210 with a salinity of 1.026 I'm not sure it would lower the salinity enough to cause that kind of RTN. Did it start to die from the bottom?

 

[franklypre]

Time to frag or you'll lose the colony, just cut it all up and place the frags all over the tank.