Coralline algae suddenly doesnt look so good

Anyone ever experience this with coralline algae.. My first glance kinda had me stumped too but I wonder if you can figure it out :p
All the algae on the below the dead algae looks good.



Crazy or what ? Lol
 
Nah, I'm almost certain it's from me doing a big water change recently last Sunday. I just bought a rodi system and that awesome mp40 up there. So now I can try to get back my tank back ontop where I want it. Meanwhile I was doing this my clownfish started laying eggs suddenly and I got a cool video ill post later haha. I thought it was was pretty cool though so I decided to share. ;)
 
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