Orange growth on rock

Joshua2598

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California
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I've never seen this on my rock before. Tank is about a month old and this has appeared in a few spots seemingly overnight.
Screenshot_20180823-073741_Gallery.jpeg
 
Looks like a sponge starting to grow. Good news!
 
If I had to guess, I'd think it is either a type of diatom or a type of cyanobacteria. Until it gets bigger or you put it under a microscope it isn't more than a wild guess.
 
There are about 3 or 4 different spots where I saw this growing in the front of the rock
 
I believe I had a sponge in my tank a few weeks ago on the tiniest piece of live rock. It died a couple weeks ago because it had no food but I recently started dosing live phyto.
20180808_163143.jpeg
 

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