Algae ID Help (possibly Lobo)

[CayoHueso]

Any thoughts on what these spots are? I'm guessing Lobophora. This is my first tank and my first run in with algae. I noticed the brown/tan spots/discoloration first. But tonight I noticed the black spots for the first time. I'm thinking it's lobo that hitchhiked in with my emerald crab. I also think his been picking it off and that may be the tan spots. Or it all may be lobo, or maybe something completely different. If I can see it so easily on the epoxy, I assume it's also all over the rock work. I read a post from another user who had success treating lobo with flucanozole. Considering treating before it gets out of control. Thoughts?

 

[CayoHueso]

You can see both the light spots and dark spots have increased in size and number since these two photos were taken on Wednesday.

 

[CayoHueso]

tested Nitrates and Phosphates. I was out of town last week and had an auto feeder set to feed 3 times daily so I thought I might have over fed the tank. Nitrate was at 14.4 ppm and Phosphate was 0.15 ppm. I had just done a 10% water change the day before.