Coralline Turning White?

[tdgates10]

I just got home from the weekend and I noticed my coralline algae was turning white in spots? I had to go to school so haven't had time to test until tonight, but anyone know the cause? Thanks

 

[mmkeeper]

Mine does it when it exposed to the air, water change.

 

[tdgates10]

hmm. I think it may be a calcium thing because mine is never exposed to air. It may be light also, because it's only on the top.

 

[Herefishyfishy]

Yeah, check your Ca, alkalinity DKH, besides the usual suspects

 

[Reeferdude]

It dies. It grows back. It may not be anything more than that. But then again better to check your parameters.

 

[tdgates10]

Checked parameters and all good there except a little high on Mg, must just being dying off a little. It's really close to the top so no biggie.

 

[Krish]

Sometimes a change in lighting will cause it as well. Changed anything to do with the lights recently?

 

[tdgates10]

Not since October.

 

[teetimefun]

If it's near the top then it may come from leaving your lights on during water changes.