What is that slow-growing red spot on my rock and algae

itelshot

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I've been observing how it got bigger in 1.5x for 2 month. Don't know what that really is. Seems like no bubble's producing. Also can try to make microscope pics later. Looks like someone poured watercolours on grass.

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itelshot

itelshot

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Yeeeaahh. I've been battling with dino after cleaning too much rock with peroxide for half a year, now it's gone. Maybe it's just a stage of re- establishing. I bought a sea urchin, btw, maybe it will eat those stots.
I will say that it looks much smaller than my dino looked in that pocket microscope, as you can see, it looks like violet fibers. Don't sure if it is cyano, cause i never had problems with it yet. Maybe it's just some sort of algae, looks like it sits mostly on HA?
 

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