My corals are bleaching??????

I have noticed that a couple of my corals are bleaching? possibly. I moved my stuff over to a new tank about three weeks ago and but even before the move I noticed a stalk of my frogspawn and a monti frag turned solid white. Now I have noticed that my little green birdsnest frag and an acro frag are white. I tested the water and it seems fine. I don't understand what is going on. Please help before I loose something else................

 

any iodine in the tank water?

 

I'm sure that there is not that I add it specifically. It sometimes gets added with purple up that my husband uses. I told him we shouldn't use that anymore, but we are finishing up what we have :-/. Anyway, the test he bought for that is so difficult that I don't test it. I guess I'll take my college education and attempt to figure this lengthy process out. He used purple up more in the old tank than this new one, mostly because he hasn't been home that often since we got it. If that helps....

 

purple up also has iodine in it. its good to check if you are adding iodine to the water. feed them anything else?? do you use moon lights?

 

i deal with nothing but acro's, what i need to know is your set up, parameters, and so on.

 

How old are your lights?

 

There is a good chance your CA is on the high side need your parameters as reef_guru stated,to know more about it, how big of a tank and so on, maybe your tank is due for a water change, purple up is just a ca additive

 

is your coraline algae bleached as well?

 

is your coraline algae bleached as well?

doing weekly water changes in my 60 gal of about 5 gallons keeps my tank at 420 calc, so if you do regular water changes adn also add purple i would imagine your calc is really high. but with out parims, cant know.

 

I have a 120 gal acrylic tank with a ReefMaster Pro refugium/sump (rated for 200 gal tank) running a Mag 12 pump and a Euro-Reef style protein skimmer (rated for 200 g). My light system has 2-250w MH, 4-96w actinic, and 8 blue LEDs. The blue lights are turned on in the mornings around 8 and go off at 8 pm. The MHs come on at 1 pm and go off at 6 pm. The LEDs and refugium lights are on during the night. I purchased my light about three months ago. I have 2-Korialia 4's in each corner pointed at 45 degree angles down and in.

I tested my tank around 5 pm last night....

ph = 8.2
nitrite = 0
ammonia = 0.25
nitrate = 0 (tested twice, guess refugium made a diff the week its been running)
phosphate = 0.25
calcium = 380
alk = 2.3
iodide/iodine = 0.01

these are all the tests I have, so I tested them all