problem please help me!

[paja 55gl]

hi 120 gl tank and couple sps corals for couple years, but last couple days mine sps corals stard bleach out more and more but everything else is ok.
120gl

light 2*175 mh

PH:8.2
ALK: normal
NO2:0.00
NO3:0.00
AMMONIA:0.00
CA:450

what hapen?
please help

 

[Corn]

what is the KH in the tank. the thing is that when you say that it is normal the is not a number so i can not tell you if it is ok or not ??? I am not saying if that is the problem or not.

 

[paja 55gl]

i just have the red see test kid and is low normal or high

 

[trueblackpercula]

heat? how old are the bulbs? new fish? flatworms? redbugs?
Michael

 

[Sk8r]

Best get the Salifert test if at all possible: numbers are life in a reef. Salifert is not as subjective as many tests.

Alk should be between 8.3 and 9.3 or thereabouts. Some run it a bit higher. Your calcium is a wee bit higher than I've ever run: I'm usually 420 max.

Heat during a lit period is a prime cause of bleaching: a thermometer going bad can be a killer. Lights starting to go can do it. How old are they?

Any new additions to the tank like a leather coral? They're onery.

 

[jjoos99]

Once these guys start to bleach out on one of the branches should you break off the affected branch? I have a green slimmer that is bleaching on one of the branches, should I snap off that branch before it would spread to the main stalk?
thanks
Jeff

sorry paja if I hijacked your post but you might need to do this too.