Whats causing my coraline to do this?

[ReefNasty]

I have a 105 gal DOS that I have converted. I had my original tank for about 3 years when I experienced a crash do to a power outage. Since then I have reset everything with a upgrade to my sump system. The new tank has been up for about 5 months and everything has been going well. PH is 8.2-8.3 with alk at 7-8. No Nitrates/Nitrites or Ammonias. I have the slightest and I mean slightest level of Phospates. Mag is good and had to shut off the calcium reactor do to continually high calcium levels (500). My reactor has been off for a week or so and the level is at 470-480 and slowly dropping. I do regular water changes. With that being said why is my coralline showing white spots all over it. On the rocks and the back of the tank where the coralline is growing and it is growing well, there are real white spots all over everything. It looks like someone splattered everything with white paint. Does anyone have an idea what this is? All help is appreciated and thanks in advance.

Tank Equipment overview
105 gal tank
Nova t5 extreme 48" lights (8 bulbs) lights run from 11 to 8
40 gal sump
refugium
MRC m1 skimmer
running carbon
Koralline calcium reactor (turned off do to high levels)

Livestock
small number of fish
mixed corals with emphasis on acros and poras

 

[Caillou]

I'm tagging along here cause that happens to me every once in a while too!

 

[coogarts]

Mine does it in certain spots, but then coraline re-establishes itself in about two weeks.

 

[Craig Lambert]

There are several things that come to mind. What was the lighting in the old setup vs the new one. Is it possible that the new lighting is much more intense? This could cause the coraline to bleach, but it should grow back.

The other thing is that your ALK is on the low side of the range. The recommended range is 7-11 dKH. You might want to boost it to 10 and keep it there. You said Magnesium was OK but you didn't post a number. The recommended range is 1250-1350. What type of salt are you using? If it's IO, your Magnesium is being depleated with water changes because IO generally tests around 1180 ime.

I have found that Coraline grows best for me with Magnesium at the high end of the range, Alk at the higher end of the range, and Calcium of around 430-440.

 

[ReefNasty]

mag was tested in the 1400's last week. The new lights are much more intense than the old ones. I will raise the alk and hopefully it will lower my calcium level quicker. My coraline seems to be growing fine it was just recently it looks all splattered with white spots. Do flatworms eat coraline?

 

[Craig Lambert]

I'm pretty sure it's just the lighting change. It should come back in time. I would just be sure to keep the Mag. level up, and make sure any water changes are done with saltwater that has the correct calcium and magnesium levels.