Coraline algae turning white

[KyleV]

What would cause my Coraline algae on my live rock and snails to whiten? I figure it would be lack of Calcium but my levels are high.

Any help would be appreciated.

[loans_n_fishes]

I was told one time that it might be a lack of magnesium. Kent makes a mg additive you can use. It definitely seemed to help mine.

[caferacermike]

Kyle should you add that you also seriously increased your MH lighting? Almost all of my coraline disappeared shortly after I went halide. It's making a comeback but very slowly.

[KyleV]

Great now with the new light coming on Tuesday everything is going to be white.

I'll try the mag starting tomorrow. thanks for the info.

[AquaDen]

Kyle, Been there before and yes, it is from the MH! The light is to intense for the existing coraline. It looks like the coraline does once a tank has been emptied and dried out, looks terrible but come back!
Gary

[Mr_Cool]

I have some turning white, too. I haven't changed lights, though. I switched to a maxijet 1200 for some better circulation, and the suction cup came loose one night (there's a surprise, huh?). Anyway, when I got home, there was sand everywhere. I mean, it was to the bare bottom in one spot, and sand was piled all over my liverock. I had to get in there and level it out. During that process, I guess I moved some smaller rocks and dead corals that had coraline algae growing on them. I think the light is hitting the coraline at a different angle now, but I'm only running PC lighting. Could THIS be the reason mine is turning white?